In the latest snapshot, whenever you ride a strider from lava to a slab back to lava it makes the strider float in the air and it shivers like it is still on land.
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Thank you for your report!
We're actually already tracking this issue in MC-176032, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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Duplicate of MC-176032