Hey, I just checked your Player.log and I was getting the exact same error (DotsSerialization_CreateReader) in the last couple of versions 2020.3 with DOTS 0.51.1. It runs fine in the player, but immediately crashes when running a built Windows executable. You can read about my troubleshooting at the bottom of this thread: How to include subscene in build? .
Unfortunately, I have not found an answer. My only recourse was to downgrade from editor 2021.3.11 to 2021.3.8. If you discover anything new, please let me know.
The bad news is that there is no fix that I know of. The good news is that one of the devs in the Turbo Makes Games discord said that they are working hard on trying to fix that bug because it was and has been a major show-stopper since 0.51 with 2021.3.9.