I had a spearmen that moved to hex 95,85. And instead of staying visible, the spearmen disappeared, but their location is hex 95,85. I cannot access them to move or fire, but can access the palisades to destroy them. This game is Skirmish 4.

Is there a partially built palisades in that same location? Known bug that you can move into a partially constructed building, but then cannot move out of it. Destroy the building OR move another stack of spearmen next to the first stack and transfer the stuck troops into the visible stack.

Ya, that's correct. I had moved spearmen into another unobserved direction, and their ending movement landed right on top of a partially completed palisades. Doesn't a fully-built palisades allow you to enter like any other building? I believe like my castle environments, that moving into or through palisades is impossible. The characters should remain on the top layer; why keep the program code for hiding them on another layer? I spent several turns to destroy partial palisades; what if there are no extra and similar troops nearby?