Hi Enigmauser,
We recently added a custom code validation in our plugin and seems like it is making the conflict there. Just to test, can you please add a random code in custom code textarea and see if this problem still exists ? Also, please make sure you flush your cache after those changes.
Regarding the custom code settings, you can check this video. https://www.youtube.com/watch?v=kjPb38-CzQY
NOTE: You don’t need to add the customCode class in input field. Just add the random code.
Thanks