Entities that are killed by status effects or explosions aren't knocked back
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MCPE-19222 has not been fully fixed; some entities that don't walk aren't knocked back when killed, plus status effects and explosions that kill entities don't knock any entity back.
The bug
Entities killed by a status effect (wither and instant damage, but might include more) or explosions have their coordinates locked when killed, and are not knocked back.
Tested in 1.19.81 and I was unable to reproduce this issue, because entities execpt entities that do not walk now take knockback upon death from status effects and from tnt explosions, however mobs aren't knocked back upon death from ender crystal explosions.
Can confirm. When they get killed by tnt, it works fine, but when killed by ender crystal, they don’t get knocked back.