The bug
Striders do not pathfind toward blocks in the #strider_warm_blocks
block tag.
Note: They do pathfind toward lava, but it is hard-coded that way. Striders only pathfind toward lava, and not any other block in this tag
How to reproduce
Add fire to the block tag / use the attached data pack
Spawn a strider in fire
→ ❌ The strider makes no attempt to stay in the fire and will walk out of it, even if it makes them cold
Related issues
is blocked by
Attachments
Comments

It is #strider_warm_blocks
, not #strider_warmables
.
Thanks, fixed
This issue essentially duplicates MC-177651, although I would suggest mentioning the block tag in that issue rather than just lava.
Makes sense to me. I'll update the affected versiosn to match those of MC-177651
Reopen. This is not fixed in the pre-release. I tested it wrong

mods, mark this as resolved, in 1.16.2 pre 1
No its not fixed. Striders DO pathfind toward lava, but if you add something else to the Strider_warm_blocks tag, they don't pathfind to it
Can confirm in 20w49a.
This affects 1.21, and I have created an updated datapack to test it:
[media]
Can this be added to the report's steps to reproduce?