I just run across this same thing.
Hardware: Sony Xperia 10+ Dual sim. Two sims and 128GB microsd (formatted to ext4 and encrypted).
My Xperia 10 was bent and had all kinds of issues, so I pulled out spare, flashed it with the bought SailfishX 3.3.something, installed some default apps (all Jolla’s), then started upgrade up to Suomenlinna. Camera app just dies after a wait. I used peterleinchen’s set of commands and that did it. Now it works.
So far I have used developer tools just for the fun of it. Mostly used ssh/scp to access the phone and update my music library. This was the first time I actually really needed those tools to get the phone up and running.
Thanks to all you more knowledgeable for solution. I had Suomenlinna also on Xperia 10 dual sim (no plus). There everything worked. Weird.