[V22 exp Build 2 - Ground Combat] Black Bars After End of Turn

After the end of a turn, black bars appear under objects/on alien ships. This is cured by having a unit look in a new direction, after which the black bars disappear. However, they come back at the end of another turn. (I think killing a unit will also trigger the black bars.) I am not sure of any other triggering conditions.

Here is a screenshot before the black bars:

Here is a screenshot when I click end of turn and the black bars have appearred:

Edit: The door to the ship remains open throughout.

Let me add another example on the arctic terrain: watch the rocks

The black background appears after new turn and is replaced by snow if someone moves.

Thanks. It's basically that the line of sight below multi-tile props is not updating properly at the start of the turn.