Confirmed in both 1.21.11, 26.1.2 and snapshot 3.
How to reproduce:
Open a superflat world with a biome where llamas cannot spawn naturally.
run the following command(* can be any 1-5 numbers)
summon llama ~ ~ ~ {Strength:*}Run the following command to get the health of the llama:
/data get entity @n[type=llama] HealthAlso run the following command to get the max_health of llama
/attribute @n[type=llama] minecraft:max_health getObserve the command output of steps 3 and 4
Expected result: The llama has the max health with 15-30, just like llamas that are naturally spawned
Actual result: The llama has 53 Health and max_health
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