Deleting a field that is a part of the field group behaves a bit differently than deleting a top level field. When deleted, similar to a top level field, it goes straight into trash without confirmation. it doesn’t, however, reach there alone; it retains its hierarchy. It’s created there as a part of a field group that has a same name as the one from which it is deleted.
Now, if you delete two fields one by one from same group, the group with same name is not created twice; it’s created once, and fields will fall into that single group.
Similar sequence happens when restoring a field. When you restore a field from trash, a field group with same name is used to hold the restored field. If field group with same name exists there, field is inserted into that group or a new field group with that name is created first to hold this field.
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