I took my turn in an async match, ended my turn, and received the following log. When I attempt to play an async match now, I just see a replay of my own turn from the erroring game.
[ 920.125] WireSocketManager -- Request '/user/keepalive' Started RID BFBACC2C-E812-4F76-8D58-0ECF45FA6183
[ 920.125] Fx::PropertyBuilder::Add -- Effect 'fx/projectile/klakegg', unable to find definition 'Delay' of PropertyDataType 'Float'
[ 920.125] Fx::PropertyBuilder::Add -- Effect 'fx/projectile/klakegg', unable to find definition 'Delay' of PropertyDataType 'Float'
[ 920.234] WireSocketManager -- Request '/user/keepalive' Completed in 0.099s RID BFBACC2C-E812-4F76-8D58-0ECF45FA6183
[ 922.703] Setting 3rd side to monster 18, ginsting
[ 922.703] Gui -- EnterScreen [gui/screenfiles/monstercard/monstercard_ingame]
[ 922.703] Gui -- Screen Focus GAINED [gui/screenfiles/monstercard/monstercard_ingame]
[ 924.093] Gui -- ExitScreen [gui/screenfiles/monstercard/monstercard_ingame]
[ 924.093] Spawning monster 18 with spawn ID 0 at level 9 for team First at position (0, 0)
[ 924.093] moving to (2, 1)
[ 924.125] Inventory -- Flushed 29 entries
[ 924.359] Gui -- Screen Focus LOST [gui/screenfiles/monstercard/monstercard_ingame]
[ 924.359] GuiManager::ProcessScreensMarkedForCleanup -- mem used 465199104
[ 924.922] Inventory -- Flushed 28 entries
[ 926.484] Moving sim/objtemplates/monsters/ginsting/level01 to (3, 0)
[ 930.125] WireSocketManager -- Request '/user/keepalive' with requirement Authenticated Enqueued RID 3CA4E67C-A5DC-4C8C-9FEA-658590FC48C7
[ 930.125] WireSocketManager -- Request '/user/keepalive' Started RID 3CA4E67C-A5DC-4C8C-9FEA-658590FC48C7
[ 930.234] WireSocketManager -- Request '/user/keepalive' Completed in 0.100s RID 3CA4E67C-A5DC-4C8C-9FEA-658590FC48C7
[ 931.797] Moving sim/objtemplates/monsters/ginsting/level01 to (4, 1)
[ 935.218] FindOptionalStateMachineIndex -- requesting unknown statemachine [debuff].
[ 935.218] FindOptionalStateMachineIndex -- requesting unknown statemachine [debuffmovement].
[ 935.218] FindOptionalStateMachineIndex -- requesting unknown statemachine [buff].
[ 935.218] FindOptionalStateMachineIndex -- requesting unknown statemachine [buffmovement].
[ 935.218] FindOptionalStateMachineIndex -- requesting unknown statemachine [debuff].
[ 935.218] FindOptionalStateMachineIndex -- requesting unknown statemachine [debuffmovement].
[ 935.218] FindOptionalStateMachineIndex -- requesting unknown statemachine [buff].
[ 935.218] FindOptionalStateMachineIndex -- requesting unknown statemachine [buffmovement].
[ 935.218] FindOptionalStateMachineIndex -- requesting unknown statemachine [debuff].
[ 935.218] FindOptionalStateMachineIndex -- requesting unknown statemachine [debuffmovement].
[ 935.218] FindOptionalStateMachineIndex -- requesting unknown statemachine [buff].
[ 935.218] FindOptionalStateMachineIndex -- requesting unknown statemachine [buffmovement].
[ 937.125] Inventory -- Flushed 6 entries
[ 937.172] Gui -- EnterScreen [gui/screenfiles/common/cmn_loading_screen]
[ 937.172] Gui -- Screen Focus GAINED [gui/screenfiles/common/cmn_loading_screen]
[ 937.172] WireSocketManager -- Request '/monster/postturndata?gameid=17e2f125-af19-4831-9753-850721613c41' with requirement Authenticated Enqueued RID 7E49A825-6B1B-48DF-A688-CCC181426ED6
[ 937.172] WireSocketManager -- Request '/monster/postturndata?gameid=17e2f125-af19-4831-9753-850721613c41' Started RID 7E49A825-6B1B-48DF-A688-CCC181426ED6
[ 948.578] WireSocket -- Protocol error: Server Error
[ 948.578] WireSocketManager -- Server Error: Server Error
[ 948.593] Gui -- EnterScreen [gui/screenfiles/common/cmn_generic_dialog]
[ 948.593] Gui -- Screen Focus LOST [gui/screenfiles/decorators/decorators_main]
[ 948.593] Gui -- Screen Focus LOST [gui/screenfiles/hud_battle/hudbattle_main]
[ 948.593] Gui -- Screen Focus LOST [gui/screenfiles/hud_battle/replay_main]
[ 948.593] Gui -- Screen Focus LOST [gui/screenfiles/common/cmn_loading_screen]
[ 948.593] Gui -- Screen Focus GAINED [gui/screenfiles/common/cmn_generic_dialog]
[ 948.593] Failed to post turn. Canceled promise
[ 948.593] Gui -- ExitScreen [gui/screenfiles/common/cmn_loading_screen]
[ 948.843] GuiManager::ProcessScreensMarkedForCleanup -- mem used 466677760