Named creakings despawn on world reload

The issue:

The 1.21.60 changelog states the following:

• Creakings are now persistent like any other hostile mob, meaning they won't disappear on save/load

• Creakings spawned from Creaking Hearts now always persist upon reloading the world (MCPE-188352)

• Creakings spawned by a Creaking Heart can now be nametagged, preventing them from despawning during the day

Despite these changes, named creaking mobs are still despawning upon reloading the world or switching dimensions, regardless of the time.

Steps to reproduce:

• Create a new world, enable cheats, and teleport to 200 100 200 (shouldn’t have to be at these specific co-ords - it’s just where I tested)

• Place 10 creaking hearts on the ground and set the time to night

• Rename all 10 of the creaking mobs that spawn - you may want to fence them in

• Set the time to noon (makes it easier to see if any despawn)

• Leave and rejoin the world a few times, and eventually one or more of the creaking will despawn

Expected results: all 10 of the named creaking mobs will remain across reloads.

Observed results: over several reloads, the number of named creaking mobs decrease, until there are none left. 

This is a frustrating issue for players like myself, who want to keep creaking mobs around in survival worlds, and completely goes against what the 1.21.60 changelog claims to have fixed.