As seen in this video, striders are supposed to be able to walk on top of mobs, treating their collision as solid: https://www.reddit.com/r/Minecraft/comments/hj9iwu/in_case_if_you_didnt_know_striders_can_walk_on/
This feature is missing in bedrock edition.
(Note that boats and minecarts are also supposed to have this property, and also currently do not in bedrock edition)
Thank you for your report!
However, this issue is Working as Intended.
The report you have submitted is working as intended: see MC-176015.
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Things such as graphics, sounds, world creation, biomes, redstone, villagers, and animals may not work the same in current versions.
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