Have you tried the workaround in the known issues list?
Solution: Install the Beechcraft King Air 350i
- Step 1: Go to Profile > Content Manager
- Step 2: Select Beechcraft King Air 350i in the list of content
- Step 3: Download and install the Beechcraft King Air 350i
- Step 3: Reboot your computer
- Step 4: Launch Microsoft Flight Simulator
CC: @DarkF4lcon
(I haven’t downloaded Japan yet, so I can’t vouch for whether it works or not.)