I have opened up missions with Schnellboot units, which came with the Spitfire and Persian Gulf modules - eg. Spitfire(CW) - Persian Gulf-Maltese Convoy - Sink U562.miz. If I change the existing type (SBOAT ESCORT1) from "Schnelboot type S-130" to "Uboat VIIC U-flak" and save the change (not saving the mission file), I can no longer change it back to "Schnelboot type S-130" because the unit's type drop-down option does not list it as an option for Third Reich.
Like before, I cannot add a new Third Reich naval unit for Schnellboot.
Looks like no one else is having this issue.
Thanks.