Henlo! More strider issues:

When walking on flowing lava, striders do not drop in height level and remain permanently floating afterwards. 

To recreate this make a floor on lava height, then create a contained lava flow as seen in the screenshots. the strider will move to the top of the lava, then permanently remain seated higher and gain a speed boost while on the flowing lava. 

This issue is similar to  MC-176074 and MC-176078