Deltarune has been updated to version 1.06 today by Toby Fox. You can get the complete patch notes for this update from here.
This patch applies to the PS4 version of the game while the Nintendo Switch patch is still not out yet. If you are experiencing any issues with the game, take a look at the patch notes below. Hopefully, it can be resolved with this latest update.
Deltarune Update 1.06 Patch Notes
While we don’t know the exact nature of fixes, the last few updates were problematic and had to be patched with a future update according to a statement shared by the developer.
Hey guys, we tried to update DELTARUNE on console, but it ended up making prior Chapter 2 save files load in the wrong place, or not at all. Working on a fix now, but it may take a while for the update to go through on Switch. Sorry for any inconvenience.