non-upright ground units flicker upright when colliding and driving on water slopes

engine : BAR105 1478
map : "Downpour 1.1"
game : MF v2.02
(replay attached)

When driving through water slopes, units flicker between their upright and sloped positions sometimes.

same issue exists on 105.0, as reported here
https://springrts.com/mantis/view.php?id=6434

Start by reproducing the attached replay with engine BAR105 1478 on “Downpour 1.1,” focusing on non-upright ground units colliding and driving across water slopes. Compare the upright and sloped positions and consider the earlier report linked in the issue; done means units remain consistently positioned without flickering.

Written by the indexing model from the issue text.