In the multplayer game Conflict in Europe Redux I have exchanged investments with a country overseas. I play the Ottoman Empire and the other country is Colombia. Relations vary around 10. I have some goldmines at Cali and they possess wool ranches at Kilikya.
From time to time either investment gets seized. Always all assets in a region at the same time but so far not for both regions in the same turn. I didn't get any hint of something unusual happening by the log, e.g. a diplomatic crisis.
Manual:
The chance of loss of the investment to the locals corresponds to the extent to which your relations fall below 0. ... You can also lose the investment as one result of a Crisis, which can occur with non-Friendly countries (those with relations of 24 or less).
...and...
In the game, a Crisis is only possible between countries with less than Friendly (25+) relations, although this Crisis limit and other Crisis factors may be modified through the game files. If the situation degenerates, you’ll be presented with a special message in your Message Log which will be in red and one of the first, if not the first, of all your entries, informing you that you are involved in a Crisis!
Maybe "Crisis" in the first paragraph is something different than in the second and something like a "hidden crisis" can occurr, that triggers the seizure of foreign investments. Can someone with knowledge of the engine please clarify?