The Bug
Creakings spawned from a creaking heart can be name-tagged once again. This feature was removed in 1.21.2 Pre-Release 1, presumably because creakings always despawn during the daytime.
This is probably due to the merging of the creaking and creaking_transient. The creaking will still despawn during the day when name-tagged.
This change wasn't mentioned in the changelogs, which suggests it may have been unintentional.
Steps to Reproduce
Summon a creaking from a creaking heart.
Attempt to name the creaking with the name tag.
Observed Results
The creaking can be name-tagged and despawn nonetheless.
Expected Results
Creakings from creaking hearts would not be able to be name-tagged.
Can confirm