I play dungeons with my son

We have poured hours into this game and both had characters around level 55.

We were fighting the Heart of Ender again (we have defeated it before) when suddenly the game crashed.

When we restarted the game, both of our characters don't appear to be there.   One other (level 8) character is still there, but both of our main ones are nowhere to be seen.

This is somewhat upsetting to lose all of that progress.   I have never seen this happen with any game in my life

Chris