if you hit a strider with a splash/lingering water bottle they fly up about 15 blocks or so
THIS ONLY HAPPENS WITH NATRUALY SPAWNING STRIDERS (this includes dismounted babies fron strider stacks) striders from a spawn eg or summon command will only get bumped slightly befor retuning to the lava as they should
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duplicates 1
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in the first 1.16 snapshot

Please check if this still happens in a freshly generated world in 1.16 Pre-release 2.
Unable to reproduce in 1.16 Pre-release 2.

This was an issue in earlier snapshot but has since been resolved, but not for already existing striders, see MC-176032.
When was the world created?