No completion icon above spinning wheels, ovens, glue masher, etc.

[tnbp]

I have what I'm sure is a very unique problem.  I have made my main base as a treehouse high on the outside of the oak tree.  It's essentially as high as you can go before you can just walk through the tree trunk.  Everything is anchored by two very tall elevators, one on each side of the base.  All told, I am 48 wall heights up from my starting level.

At that height, none of the production stations show the check mark that they have completed whatever they were doing.  It's definitely a problem specific to the height because if I relocate them back to ground level (or close to ground level) in the same game, the check marks reappear.  So spinning wheels no longer have them, ovens no longer have them, glue mashers, whatever.  Anything that would normally show that check mark no longer does at that height.