I am trying to: Ensure a custom field associated with a custom post type is required.
Steps to reproduce
I installed a fresh copy of WordPress (5.8.1) and Toolset Types (3.4.14)
I created a new post type
I created a new custom field associated with that post type (a multiline field) and set that it is required
I then went to add a new item for that post type. Without populating any of the fields, I hit publish
I was expecting to see validation errors as the required field is not populated and the post to Not be saved
Instead the post was saved and published AND the validation errors showed
Create a custom field in a custom post type and set that field to required.
I was able to replicate this issue you are having and escalated it to our 2nd tier support team for further checks.
However the issue only occurs when the editor for the post has been disabled. For now you can workaround the issue by enabling the default editor for the post and the validations should prevent the user from submitting the posts without the field being filled in.
Great. I can confirm that this issue has been escalated to our development team so there isn't much else that we can do here until this is patched by our development team.