I have switched from Classic Editor to Gutenberg Editor on a website. I have 4 custom field groups for a custom post type. Before the switch everything worked. Now only 3 is visible on the backend. I can see all 4, but other admins can see only 3.
Context is set to "After content" in all cases. I checked Preferences in Gutenberg, but this missing field group is not there.
The fourth field group could be hidden by a conditional logic or advanced location rule. Can you please recheck this? If you don't find that, please export the field group to a JSON file and share it here. I will import it to my local site and take a look.
I've imported the field group to my local site, assigned it to a post type and the field group displays as well when editing the post. Can you please ask other admins if it is moved to the sidebar?
If not, please share your site credentials to this contact form https://metabox.io/contact/, I will take a closer look.