You can brush through entities even though their hitbox block player's actions such as mining.
It's worth to mention that reproduction of this bug is sometimes not reliable.
How to reproduce
Summon any mob in front of you.
Brush any block within your range.
Slowly move your camera towards the mob while still brushing.
Notice how you are still brushing through it's hitbox.
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Depends, was the issue actually fixed in 13a, is so, it should be a separate report with a "clones" link.

This is a repeat of MC-260898

If you read the title you can tell i was aware of the linked report, however i didn't check if it was fixed in the previous snapshot, so anyone feel free to confirm if that's the case.

I can no longer reproduce this, leading to a new behavior: MC-262105.
Duplicate of MC-260898