I totally 100% agree that this should be part of ACF !
At this point, since the (and I’m guessing here) the AJAX auto refresh is not firing, even though the fields are actually getting updated on Save, but if this is not good enough for you, I don’t see any options for you but to downgrade the php version to 7.4.
Please also note that WordPress/Gutenberg is probably not fully php 8 ready, and the new upcoming ACF version is attempting to be php 8 ready. However, the new dev/beta version’s are still receiving deprecated notices, from what I read from their ACF Github bug reports. ACF is going to try to resolve the remaining deprecated issues by the time the production version of it’s plugin is released… I know that WordPress 6.2 changed the way it displays the Editor, breaking the Edit view of the ACF Blocks, among with breaking some other non ACF plugins. They reverted those changes, but will be introduced again with WP 6.3, so developers will have more time to adjust their codes. I’m saying all this, because the issue could NOT be necessarily with this plugin itself, but ACF or even Gutenberg, which if it is, this issue might be resolved by them in time. If you can’t wait (for miracles), I’m afraid the only suggestion I have for you is to downgrade to php 7.4.
Also note that you can’t use this plugin in with Repeater fields that have the pagination turned on. I will have to ask them if there is something ACF has to do so we get a fix for it…