We do not have a version 5.3 to provide you which is why we always mention you should have a back up before doing any updates to any plug-ins.
We need to see you Plug-in environment (see posting guidelines) . What you have provided us does not provide any information .. Also need the site you are deploying the plug-in on. Do you have JS script errors
I have not tested with WP version 6. Everything is working on the WP 5.8.4 that I have tested.
From their support channel “So you’ve just updated to WordPress 6.0! But what’s this? Something broke? Or maybe you just have some questions you want to ask? This will help guide you through both troubleshooting, and common questions after the new update.
If your site broke, don’t panic!
Before you go any further, make sure you’ve updated your plugins and themes to the latest versions, clear your browser’s cache and cookies and re-log in to your WordPress dashboard.
So first suggestion
If you roll back Word Press to an earlier version do you see any issues.