Short and lazy version:
New 2.2b4 available
New since last beta:
Fixed GroundEntChanged gamedata lookup.
Fixed one potential crash when bad or missing gamedata.
Improved error messages.
For bots joining server, OnEntityCreated fires before SM thinks that the bot's client index is a valid entity. I haven't decided on the best way to fix this yet.
If no issues, I'll soon make this the official release as 2.1 is aging badly on some games.