simple to reproduce
open 10.5.10
open control room
put a random plug in the monitor inserts
quit cubase
restart
check out your control room inserts - the plug is now missing
(if you want to do combinations of load projects/saving etc be my guest - CR is a global setting and isn’t dependant on that)
this is because of this bug - https://www.steinberg.net/forums/viewtopic.php?f=283&t=179838
This is also going to effect other aspects such as audio connects - vst connect etc. All those things that do a “save on exit”
was working fine in 10.5.0 and is still working fine in 10.0.50