This issue has been happening since the daily trials update. Normally, mobs enchanted with the enchantment in Daily Trials have their normal health, however Baby Slimes have an unusual amount of health compared to the other mobs.

Steps to reproduce:

1. Play a Daily Trial where melee mobs can get an enchantment and where Slimes can spawn
2. Kill the slime, and another time when it splits into medium slime
3. Notice the small slime has much more health, even compared to the large and medium slimes.

I have not had an opportunity to record the issue, apologies for the inconvenience.