Button in Emails


I’d appreciate any help or guidance.

Thank you in advance.

Your software
My Mautic version is: 2.16.2
My PHP version is: 7.3

Your problem
My problem is:
Having a bit of an issue when trying to save an email with a button that I had added from slot types.
I click on Apply and instead of saving my email the editor closes and gets me back to choose the email type. All changes I did aren’t being saved.
I have tried all other slot types, and this is the only one that is acting weird. Anything different with buttons? or is this a bug?

Any help appreciated.

These errors are showing in the log: no errors in the log

Steps I have tried to fix the problem: cleared cache, tried different themes, tried new emails both Template email and Segment email, tried duplicating an existing button included in a template