The mob-to-player collision does not exist. You can push mobs, they can push each other, but they can't push you.
The expected is that mobs can collide with you as in Java or as in old versions.
Linked issues
duplicates 1
Comments 2
Thank you for your report!
We're tracking this issue in MCPE-12842, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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Duplicate of MCPE-12842, which is working as intended.