One of the quick yes/no questions (tried googling and Merlin(g))…
It seems, that when I reload a saved project where one or more of the recorder buffers held a recording which was not saved, this recording is brought back?
Can that be the case? If yes, where did it store that file?
nah man recorder buffers are stored in the ram and never anywhere else unless you intentionally save them unfortunately. save your parts, save your buffers, save your project