In the third section of Deb Escape, you can clip to the top of this board by just jumping underneath it. Very consistent. (In OG DS, the upwarp doesn't work, but you can climb up the sides of the blocks). Perhaps there are more upwarps in this game that are yet to be discovered.

Link to Deb Escape upwarp with timestamp:

You can also upwarp through boards in Gill Escape, however, this is not necessary, as you can scale the walls of the boxes before. You can do this by hugging the wall and jumping, which results in you snapping to the top of the box.