Disable blog comments for Admin role

I've noticed this on a couple of projects recently. It's possible to prevent the comment area appearing on a blog post if the Editor role has "Enable comments on a post" unticked. But if I try to do the same for the Admin role, the setting isn't retained. It appears to save the setting, but if I move out of that screen and return to it, that setting is now ticked.

Is there any way to remove comments from blog posts for the Admin role?

    Perch Runway: 3.1.1, PHP: 7.2.0, MySQL: mysqlnd 5.0.12-dev - 20150407 - $Id: b396954eeb2d1d9ed7902b8bae237b287f21ad9e $, with PDO
    Server OS: WINNT, apache2handler
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    PERCH_PATH: C:\wamp\www\butterworths\cms
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    PERCH_RESFILEPATH: C:\wamp\www\butterworths\cms\resources
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    F1: 3b606135b33e6a102526838f4152a807
    Resource folder writeable: Yes
    HTTP_HOST: butterworths.local
    DOCUMENT_ROOT: C:/wamp/www/butterworths
    REQUEST_URI: /cms/core/settings/diagnostics/
    SCRIPT_NAME: /cms/core/settings/diagnostics/index.php