I occasionally use the "Location - Position Aircraft in Air" menu option to get a quick overview over an airport. Today I accidentally clicked "Random Attitude" while the plane was standing on a runway. This dropped down my plane from an altitude of maybe 30 m above ground, causing it to end up in a more or less inconvenient orientation (usually on its back). I don't want to ask what this function is supposed to do -- after all it kind of does what the menu suggests -- but there seems to be a strange bug.
After the plane ended up on its back several times, I tried to correct this by "Position Aircraft in Air", but then it got really weird: I ended up on a ghost ship with eerily glowing containers. And although I started in daylight, it suddenly was dark.
Depending on your starting attitude or altitude, you can also end up inside this ship's hull, partly submerged in water.
Looking at the internal properties, I found that I was at the location N/S 0.000, E/W 0.000, i.e. in the Atlantic ocean, where somebody has conveniently placed this ship object to save unlucky pilots from drowning. The ship isn't part of the bug. It's really there, and you can visit it in a more orderly fashion by using the "Position Aircraft in Air" dialog. You can even land on the wake...
Whatever went wrong with the "Random Attitude" function messed up FG permanently, i.e. it couldn't be corrected by choosing another airport, location or altitude, or by using the reset option -- the latter caused FG to crash. (My FG version is 2018.3.6.)
The glowing containers seem to be a separate problem. I never noticed this before, but I mostly fly during daylight. I don't know if all ships are affected or only this one (or the object used in this case).