A rabbit modified to become “The Killer Bunny” through /data modify entity @n[type=rabbit] RabbitType set value 99 and then set back to a normal rabbit type with the same command will change its texture back, but continue to attack players.
The attack sound no longer plays when it attacks the player.
Thank you for your report!
After consideration, the issue is being closed as Won't Fix.
Please note that this is not the same as Working as Intended, as this bug report correctly describes behavior in the game that might not be the intended or desirable behavior, but it will not be fixed right now. Sometimes, this is because the issue reported is minor and/or impossible to change without large architectural changes to the code base.
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