XF 2.1 ImageMagick/Animated GIF Strangeness


We have a strange issue where animated GIF avatars aren't working as expected since upgrading from 1.5 to 2.1 on Tuesday.

I've verified we are on a new/current build of ImageMagick, and selected that as the attachment handler. We are also running PHP 7.4.5.

What's really odd is that the images work fine in some pages, but not others. For example,

The avatar will not load in a member profile page, see mine here: https://www.hometheaterforum.com/community/members/dave-upton.383964/

But if I go to edit my avatar, or look in a forum view, ie here: https://www.hometheaterforum.com/community/forums/forum-help-and-feedback.18/ you'll see it's animated.

Any ideas what might be causing this?