Steps:

1. Go to content types
2. Go to content group
3. Edit any content type, for example article
4. Delete any field type
5. Click close
6. Edit the same content type

Result:

The deleted field type is still missing.

Expected result:

Actions shouldn't save changes.

Actions on field types: add, remove, reorder hit endpoint for form and these actions save the draft. When we enter the edit we are editing this draft. This might be confusing for user.