When trying to brush blocks and your crosshair is close to any mob, brushing can be interrupted if you look very close to their hitbox. This doesn't happen when you're trying to mine blocks.

How to reproduce

1. Get a brush.
2. Summon any mob.
3. Try to brush blocks when your crosshair is close to the mob's hitbox (Enable F3+B).
4. Notice how the brushing action is interrupted.

Expected result
Brushing action should only be interrupted when looking at the mob's hitbox.

Observed result
Brushing is interrupted in angles where it shouldn't.