Mobs unable to jump on the big dripleaf.
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I also can confirm

I confirm
Can confirm in 21w11a. Video attached.
Can confirm in 21w14a.
Confirmed for 21w16a, it also happen to azalea, mobs unable to jump on the (flowering) azalea too
Confirmed for 21w17a

Still happening in 1.18 Pre-1
Can confirm in 1.18.1.

Can confirm for 22w05a
Can confirm in 1.18.2.
In 1.20.2 Pre-Release 3
In 23w44a. And they don't try to go around it, just like with the related reports
Can confirm