What I expected to happen was...:
The wolf's health should remain the same regardless of whether or not its data is modified.
What actually happened was...:
The wolf's health resets to 20 when its CustomName nbt tag is modified, regardless of the wolf's current maximum health attribute or health boost potion effect.
Steps to Reproduce:
1. Obtain a tamed wolf
2. Damage the wolf or modify its health using commands to make sure the health does change when its name is modified.
3. Use a command to modify the wolf's CustomName and watch the health reset to 20.
Link to video
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We're tracking this issue in MC-193202, so this ticket is being resolved and linked as a duplicate.
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