The strider can take damage in water and in rain, however not with water potions, they have no effect towards it and take no damage
MCPE-103078
Striders don't take damage when splashed with splash/lingering water potions
Resolved
Duplicate
1
M0nst3rJam
(Unassigned)
Unconfirmed
Multiple
1.16.100.60 Beta, 1.16.30.53 RTX Beta, 1.16.50 Hotfix (iOS), 1.16.40 Hotfix, 1.16.61 (PS4)
Retrieved
Thank you for your report!
We're actually already tracking this issue at MCPE-80715, so I will resolve and link 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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