Applying levitation to a Strider walking on lava doesn't cause them to levitate off the lava.
To replicate:
Spawn a strider in lava
Run the command: /effect give @e[type=strider] levitation 10 10
MC-176203
Striders with Levitation walking on Lava don't levitate
Resolved
Fixed
3
bluecrab2
kingbdogz
Confirmed
Low
Mob behaviour
20w13a, 20w13b, 20w14a, 20w15a, 20w16a, 20w17a
20w18a
Retrieved
Same thing happened to me (Snapshot 20w13b)