Destroying an enemy outpost does not end the area, causing a flickering HUD

[Bangesh]

Hello everyone,
first time posting in this forum so please excuse any missing information that I should provide.

In a commitmend  savegame I attacked an enemy outpost, 1 enemy 2 turrets, and destroyed it. I formed a caravan afterwards and moved back towards my settlement.

From this point on I had this window pop up every 2-5 seconds and a constantly disappearing and reappearing flickering HUD: https://i.imgur.com/nDfEJu9.jpg
When I formed my caravan to move back to my settlement there appeared another - empty - caravan, which doesn't disappear: https://i.imgur.com/PkDsktX.jpg
There are no colonists inside that caravan and even the colonist, the caravan is named after, is already back in my settlement.

Is there a way to rescue my save file?

In high hopes,
Bangesh