When a player's generic.step_height attribute is increased (e.g. with the attribute command), attempting to step onto a column of blocks that is smaller than the step height but still taller than two blocks fails if there are blocks higher up on the same column that the player cannot get on because of the step height being too small.

How to reproduce:

• Modify your step height to e.g. 10:
  /attribute @s generic.step_height base set 10.0
• Place three blocks of stone, then leave three blocks of air above, then place another six blocks of stone above (see attachment)
• Stand to the side of the whole pillar (where the armour stand is located in the attachment) and walk into the bottom of the lower three blocks
  You cannot step on top of the three blocks (where the item frame is located in the attachment)