After a Slime/Magma Cube splits into smaller ones or after a mob converting because of zombification they loose their attributes, when they should keep them.
Environment
current pre release
MC-298482
Converted Mobs (E.g. Zombified Piglins) don't keep attributes after convertion
Resolved
Invalid
0
From the 24w37a changelog:
In last week's snapshot, we fixed a bug related to which data gets transferred between mobs when converted from one type to another (ex: zombie to drowned). This week, we have reverted a few of those changes (health, attributes, and loot tables are no longer transferred).
The full list of tags, data, and other properties which get transferred when a mob is converted can be seen in the 24w37a changelog.