While Illager Beasts can already destroy leaves and crops, it might be expected from most players that beasts can destroy other plant life too. However this isn't the case.
Tested with:
Lilypads
Vines
All flowers (wither rose might be WAI)
Cacti (might be WAI)
Grass, its variants, and dead bush
Coral fans (living and dead)
(Not tall) Mushrooms
Sugar cane
Kelp
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Comments 3
It seems to make sense to me, leaf blocks are solid and so they need to be broken if an illager beast needs to travel through the jungle. However, most of the blocks you listed are non-solid, so the beast shouldn't need to destroy them to get past (although you could argue that the beast's large size would trample and destroy small vegetation).
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It is not a bug but a feature suggestion, howerver it should be considerated because it seems logic, at least for flowers