Another stupid omission on my part - missed a couple of commas between fields when it adds the product to the database. I've fixed the error but can't see why it isn't redirecting after completion - it updates, just doesn't redirect correctly to product edit as it should.
Since I'm now working from changed files, I'll issue a v9.2.3 when done.
I'm not sure what issues you may encounter from a downgrade - in theory, you may be okay, but the older version had issues anyway.
[Edit] v9.2.3 released with all bug fixes.
Server specs (Server OS / Apache / MySQL / PHP / DragonflyCMS):