Issue with Blocks on different post type templates

Hi,

I am not sure whether this is a bug with my template code or the blog application, but it seems that when first choosing a post template that includes blocks they do not load as expected.

I've taken a quick screen capture to show the steps to reproduce: https://www.dropbox.com/s/gr3rhy9zlb6u5sj/perch_blog_blocks.mov?dl=0

Here is the post template in question:

<perch:template path="blog/partials/_post_main.html" />

<perch:blocks divider-before="List Sections">
    <perch:block type="list_item" label="List Item">
        <perch:blog id="section_title" type="text" label="Title" title="true" size="xl" required="true" suppress="true" />
        <perch:blog id="section_content" type="textarea" label="Content" editor="redactor" html="true" bucket="editor" imagewidth="655" required="true" suppress="true" />
    </perch:block>
</perch:blocks>

<perch:template path="blog/partials/_post_meta.html" />

Post Main:

<perch:blog id="postTitle" type="text" label="Title" required="true" size="xl autowidth" order="1" suppress="true" />
<perch:blog id="postLead" type="textarea" label="Lead" size="xs" required="true" suppress="true" help="This will also be the preview text shown on the main blog page." />
<perch:blog id="postDescHTML" type="textarea" label="Post" editor="redactor" html="true" bucket="editor" imagewidth="655" required="true" suppress="true" />

Post Meta:

<perch:blog id="preview_image" type="image" label="Preview" bucket="blog" crop="true" width="350" height="550" suppress="true" divider-before="Preview" help="Thumbnail displayed on the main blog page." />
<perch:blog id="preview_image" type="image" bucket="blog" crop="true" width="350" height="220" suppress="true" />

<perch:categories id="categories" set="blog" label="Categories" display-as="checkboxes" divider-before="Post Options" suppress="true" />
<perch:blog id="postDateTime" type="date" label="Date" time="true" suppress="true" help="Set this to a future date / time to schedule a post." />

Diagnostics:

Perch: 2.8.34
Production mode: Development (10)
Installed apps: content (2.8.34), assets (2.8.34), categories (2.8.34), root_analytics (1.1.0), perch_blog (5.0), root_heartbeat (1.0.1)
DB driver: PDO
DB tables: perch2_blog_authors (1), perch2_blog_comments (0), perch2_blog_index (96), perch2_blog_posts (4), perch2_blog_posts_to_tags (0), perch2_blog_sections (1), perch2_blog_tags (0), perch2_blogs (1), perch2_categories (3), perch2_category_counts (1), perch2_category_sets (1), perch2_content_index (212), perch2_content_items (32), perch2_content_regions (12), perch2_navigation (0), perch2_navigation_pages (0), perch2_page_templates (2), perch2_pages (2), perch2_resource_log (22), perch2_resource_tags (0), perch2_resources (20), perch2_resources_to_tags (0), perch2_root_analytics_cache (3), perch2_settings (31), perch2_user_passwords (0), perch2_user_privileges (35), perch2_user_role_privileges (16), perch2_user_roles (2), perch2_users (1)
Users: 1
PHPMailer: 5.2.21
App runtimes:
<?php
    $apps_list = array(
        'content', 
        'categories',
        'perch_blog',
        'root_analytics'
    );
Scheduled tasks for perch_blog: delete_spam_comments (1440 mins)
Scheduled tasks for root_analytics: root_analytics_fetch_comparisons (1440 mins)
Scheduled tasks for root_heartbeat: root_heartbeat_broadcast_status (1440 mins)
Editor plug-ins: markitup, redactor
H1: 9cd3756f4c13c8e2246771908bf99659
L1: 9806c53415b42db0c289fe14fc0a6986
F1: 6a33f95eca3667f9e0c39bf5ca2980fe
headerColour: #0B6271
content_singlePageEdit: 1
helpURL: mailto:design@rootstudio.co.uk
siteURL: /
hideBranding: 1
content_collapseList: 1
lang: en-gb
update_2.8.34: done
latest_version: 2.8.15
on_sale_version: 2.8.34
headerScheme: dark
root_analytics_namespace: Root Analytics
root_analytics_view_id:
root_analytics_credentials_json:
root_analytics_time_period: 90
root_analytics_ua:
root_heartbeat_uid:
root_heartbeat_signature:
root_heartbeat_master_server:
dashboard: 0
hide_pwd_reset: 0
content_hideNonEditableRegions: 0
content_frontend_edit: 0
logoPath: /admin/resources/coli-avatar3x.png
perch_blog_update: 5.0.1
perch_blog_post_url: /blog/post.php?s={postSlug}
perch_blog_site_name:
perch_blog_slug_format: %Y-%m-%d-{postTitle}
perch_blog_akismet_key:
perch_blog_max_spam_days: 0
perch_blog_comment_notify: 0
PERCH_DEVELOPMENT: 10
PERCH_STAGING: 50
PERCH_PRODUCTION: 100
PERCH_TZ: Europe/Moscow
PERCH_LOGINPATH: /admin
PERCH_PATH: /Users/James/Repositories/Misha/Coli-Crocodile-Core-Site/build/admin
PERCH_CORE: /Users/James/Repositories/Misha/Coli-Crocodile-Core-Site/build/admin/core
PERCH_RESFILEPATH: /Users/James/Repositories/Misha/Coli-Crocodile-Core-Site/build/admin/resources
PERCH_RESPATH: /admin/resources
PERCH_HTML5: 1
PERCH_DB_USERNAME: root
PERCH_DB_SERVER: localhost
PERCH_DB_DATABASE: colic_perch
PERCH_DB_PREFIX: perch2_
PERCH_EMAIL_FROM: james@rootstudio.co.uk
PERCH_EMAIL_FROM_NAME: Root Studio
PERCH_DEBUG: 1
PERCH_PRODUCTION_MODE: 10
PERCH_RUNWAY:
PERCH_ERROR_MODE: DIE
PERCH_DATE_LONG: %d %B %Y
PERCH_DATE_SHORT: %d %b %Y
PERCH_TIME_SHORT: %H:%M
PERCH_TIME_LONG: %H:%M:%S
PERCH_RUNWAY_ROUTED:
PERCH_STRONG_PASSWORDS:
PERCH_PREVIEW_ARG: preview
PERCH_TEMPLATE_PATH: /Users/James/Repositories/Misha/Coli-Crocodile-Core-Site/build/admin/templates
PERCH_DEFAULT_DOC: index.php
PERCH_DEFAULT_EXT: .php
PERCH_RWD:
PERCH_HTML_ENTITIES:
PERCH_SSL:
PERCH_STRIPSLASHES:
PERCH_PROGRESSIVE_FLUSH: 1
PERCH_PARANOID:
PERCH_FORCE_SECURE_COOKIES:
PERCH_PASSWORD_MIN_LENGTH: 6
PERCH_MAX_FAILED_LOGINS: 10
PERCH_AUTH_LOCKOUT_DURATION: 1 HOUR
PERCH_VERIFY_UPLOADS:
PERCH_AUTH_PLUGIN:
PERCH_DB_CHARSET: utf8
PERCH_DB_PORT:
PERCH_DB_SOCKET:
PERCH_SESSION_TIMEOUT_MINS: 20
HOSTING SETTINGS

PHP: 7.0.13
Zend: 3.0.0
OS: Darwin
SAPI: cgi-fcgi
Safe mode: not detected
MySQL client: mysqlnd 5.0.12-dev - 20150407 - $Id: 241ae00989d1995ffcbbf63d579943635faf9972 $
MySQL server: 5.6.34
Free disk space: 318.13 GB
Extensions: Core, date, libxml, openssl, pcre, sqlite3, zlib, bcmath, bz2, calendar, ctype, curl, dom, hash, fileinfo, filter, ftp, gd, SPL, iconv, intl, json, ldap, mbstring, session, standard, mysqlnd, PDO, pdo_mysql, pdo_sqlite, Phar, posix, readline, Reflection, mysqli, SimpleXML, soap, sockets, exif, tokenizer, wddx, xml, xmlreader, xmlwriter, xsl, zip, cgi-fcgi, imap, gettext, mcrypt, pgsql, pdo_pgsql, imagick, igbinary, memcached, xdebug
GD: Yes
ImageMagick: Yes
PHP max upload size: 32M
PHP max form post size: 32M
PHP memory limit: 128M
Total max uploadable file size: 32M
Resource folder writeable: Yes
Session timeout: 24 minutes
Native JSON: Yes
Filter functions: Yes
Transliteration functions: Yes
PHP_FCGI_CHILDREN: 4
PWD: /Applications/MAMP/fcgi-bin
PHP_FCGI_MAX_REQUESTS: 200
__CF_USER_TEXT_ENCODING: 0x1F5:0x0:0x2
ORIG_SCRIPT_NAME: /fcgi-bin/php7.0.13.fcgi
ORIG_PATH_TRANSLATED: /Users/James/Repositories/Misha/Coli-Crocodile-Core-Site/build/admin/core/settings/diagnostics/index.php
ORIG_PATH_INFO: /admin/core/settings/diagnostics/index.php
ORIG_SCRIPT_FILENAME: /Applications/MAMP/fcgi-bin/php7.0.13.fcgi
SCRIPT_NAME: /admin/core/settings/diagnostics/index.php
REQUEST_URI: /admin/core/settings/diagnostics/?extended
QUERY_STRING: extended
REQUEST_METHOD: GET
SERVER_PROTOCOL: HTTP/1.1
GATEWAY_INTERFACE: CGI/1.1
REDIRECT_URL: /admin/core/settings/diagnostics/index.php
REDIRECT_QUERY_STRING: extended
REMOTE_PORT: 62976
SCRIPT_FILENAME: /Users/James/Repositories/Misha/Coli-Crocodile-Core-Site/build/admin/core/settings/diagnostics/index.php
SERVER_ADMIN: you@example.com
DOCUMENT_ROOT: /Users/James/Repositories/Misha/Coli-Crocodile-Core-Site/build
REMOTE_ADDR: ::1
SERVER_PORT: 80
SERVER_ADDR: ::1
SERVER_NAME: colicrocodile.local
SERVER_SOFTWARE: Apache
PATH: /usr/bin:/bin:/usr/sbin:/sbin
HTTP_ACCEPT_ENCODING: gzip, deflate
HTTP_ACCEPT_LANGUAGE: en-gb
HTTP_REFERER: https://colicrocodile.local/admin/core/settings/diagnostics/
HTTP_USER_AGENT: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_1) AppleWebKit/602.2.14 (KHTML, like Gecko) Version/10.0.1 Safari/602.2.14
HTTP_ACCEPT: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
HTTP_UPGRADE_INSECURE_REQUESTS: 1
HTTP_CONNECTION: keep-alive
HTTP_COOKIE: _ga=GA1.2.288956060.1481538580; PHPSESSID=f06dbed7b2520b8a31ecc325fc0fc68e; cmsa=1; __insp_slim=1479725357427; __insp_norec_sess=true; __insp_nv=true; __insp_targlpt=Social%20Change%20UK%20%3A%3A%20Inspiring%20change%20in%20people%20and%20communities; __insp_targlpu=http%3A%2F%2Fsocial-change.local%2F; __insp_wid=1206163498
HTTP_HOST: colicrocodile.local
REDIRECT_STATUS: 200
REDIRECT_HANDLER: php-fastcgi
FCGI_ROLE: RESPONDER
PHP_SELF: /admin/core/settings/diagnostics/index.php
REQUEST_TIME_FLOAT: 1484315134.08
REQUEST_TIME: 1484315134
argc: 1

Thanks!