so few minutes ago, the fix for crash at starting game has been merged and ready to go (it was Aftershock’s item group bug) but i found the same problem for PK’s Rebalancing mod.
the fix is to go to pk_itemlist_edit located at “spawns” folder of PK’s Rebalancing and find itemgroup id “mischw” and below the (“type”) line add (“subtype”: “collection”,) to fix crash on startup using PK’s Rebalancing mod.