If a mob is affected with health boost (any level) and has health over the normal amount, its health will be reset back to the normal amount for that mob when the player relogs. The health boost effect isn't lost, but the hp of the mob is just reset back to the default amount.
Steps to Reproduce:
Spawn a mob
Effect them with a high level of health boost using commands
Throw lots of healing potions on the mob
Hit with a netherite sword (notice it doesn't die)
Leave and rejoin the world
Hit with a sword again
Observed Results:
The mob keeps the health boost effect, but its health gets reset back to default
Expected Results:
The mob keeps the same amount of extra hearts it was healed before relog.
Linked issues
is duplicated by 1
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Comments 5

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Your report does not contain enough information to understand or reproduce the problem.
Please add the following information to the Description, as shown here:
Steps to Reproduce:
1. (list every step completely, so someone else can reproduce the issue)
2.
3.
Observed Results:
(briefly describe what you see happen, including any message(s) shown)
Expected Results:
(briefly describe what should happen)
Try following your steps to make sure you include everything and can still reproduce the issue yourself. Be sure to include exact and complete commands if any are used.
Screenshots and videos are helpful, but should not be used as a replacement for the above information
This report has been temporarily resolved as Awaiting Response. It will automatically reopen when you add information. Please follow the format shown and include all sections (steps, observed, expected). Reports that do not contain all of the requested information and complete steps to reproduce the issue may be closed as Incomplete. For more information please read the Bug Tracker Guidelines.
Many players find this Bug Report Creation Form useful for filling in all helpful information.