I seem to be having a few issues when publishing a private island.
When I test my game on PS5 (via UEFN) it runs perfectly, as it should. However when I play the private version (with the private island code provided), my character reverts to the default character and I do not have footstep sounds or vehicle sounds. Everything else works except for that.
After doing a bit of fiddling around, it seems to have something to do with the PS5 Cache. I unplugged the power chord for about a minute or two and everything loaded as it should. Will be keeping my eye on it just in case.