Ok so I recently played some railjack missions with my friend and I encountered a bug which is my absolute favourite I think.
I am not completely sure how it happens, though I have a hunch it has something todo with having the omnitool equipped and teleporting/changing into a turrent/necramech/whatever.
Anyway I was mucking around in a loot cave when I noticed I could not raise my mouse higher then 20° or so. (If we define looking parallel to the ground as 0°)
However I still had my full range of mouse movement, lets just say it was not the most useful range. :D
When I changed into the necramech my range of movement was offset correctly - but even after exiting the necramech again it stayed that way for the warframe until the next loading screen.
I found it more hilarious than annoying but thought I should report this anyway.