I re visited this issue earlier this morning. To save potential upset from losing a lot of work ( ! ) , I made a few small changes. The changes were limited to room exits, nothing else.
Before closing JSWED, I saved it as a .tap , changed the options to save as .z80 , saved as that, changed the options to save as a .sna and saved it as that. I did try as +3dos but was not really sure what file format it was expecting.
Summary is all three do not work. I'm at least happy I did not spend ages then realise this again hehe.
Using 2.3.7 . I did try with 229 but that does not recognize JSW2 and out of interest I tried loading the 'dud' files back to it, it was not happy but that was expected.
If you would like said saved files (sna/tap/z80) let me know I have saved them.
The only thing is I used the Richchet release (but it is supported from what I can see) simply as that has keypad bypass there (well, kind of) and I had it to hand.