The bug

Pillagers and piglins can hardly hit the mobs lower than a block with a crossbow.
Unlike MC-260003, the pillagers and piglins will try to aim downward, but the angle of aiming downward is still not enough.

Reproduce steps

1. Give yourself a pillager spawn egg.
2. Give yourself a piglin spawn egg.

   /give @p piglin_spawn_egg{EntityTag:{id:"minecraft:piglin",IsImmuneToZombification:1b,HandItems:[{id:crossbow,Count:1b},{}],IsBaby:0b}}

3. Give yourself a baby turtal spawn egg.

   /give @p turtle_spawn_egg{EntityTag:{id:"minecraft:turtle",Age:-999999}}

4. Spawning a pillager or piglin.
5. Spawning a baby turtle on the third block from the pillager or piglin.
6. Use the following command:
   Pillager

   /damage @e[type=minecraft:pillager,limit=1] 1 minecraft:generic by @e[type=minecraft:turtle,limit=1] from @e[type=minecraft:turtle,limit=1]

   Piglin

   /damage @e[type=minecraft:piglin,limit=1] 1 minecraft:generic by @e[type=minecraft:turtle,limit=1] from @e[type=minecraft:turtle,limit=1]

7. Found out that the pillager or piglin is difficult to hit the target.