Issue with port strike mission terrain and ships not loading properly in 1984 Soviet Campaign

[SHP509]

Checkspawndepth could not find a valid position for kmn_84_ffg_oslo and it was killed

Issue description:

The terrain does not load properly, trees are above my sub (Oscar 2), the Nato defense ships are killed immediately on spawn and the minimap is empty of ports and ships, meaning the mission cannot be completed.

The same issue occurred in a Kirov playthrough