Server crash when a player join the game

[spark rune]

** ✅ SOLVED : Wine 8 -> Wine 11**

This exact issue have been reported multiple times (same final log error)

https://discord.com/channels/1260209458924224542/1495392256935465042
https://discord.com/channels/1260209458924224542/1495460581577326602

I'm providing additional details, compiling importants logs relative to the crash.

Hosting company : myself
Build : Debian / Wine, no dockers.
(8/16 core / 30go ram)

1 : Broken network event

Disconnect with error. error_code UNKNOWN. error_message 'Stream removed'. error_details ''.```

### 2 : Explicit fatal error in network layer
```LogWindows: Error: appError called: Fatal error:
[File:D:\redacted\Source\R5Net\Cpp\Cm\GsStream\R5NetCmClient_GsStream.cpp] [Line: 203]

[1381541] R5NetCmClient_GsStream::SetBrokenState
[Gs-853739A812524438FB9B163F74D7900B] GsStream is broken.
ErrorMessage 'Cm disconnected. Status 2 ('Stream removed'). CallNumber 1'. PrevState Registration```

### 3 : Assertion Failed on gRPC
```R5LogNet: Error:
[014921] FR5NetModule::StartupModule::<lambda>
ASSERTION FAILED: result.bytes_transferred == buffer_->Length()
[D:\Source\Build\work\grpcRepoCheckoutDir\src\core\lib\event_engine\windows\windows_endpoint.cc:355]
[D:\Source\Build\work\gameRepoCheckoutDir\Plugins\R5BusinessLogicCore\Source\R5Net\Private\R5NetModule.cpp:35]```

### 4 : Final crash 
```LogOutputDevice: Error: === Crash Stack Trace
LogOutputDevice: Error: [Callstack] 0x000000014ba7d628 WindroseServer-Win64-Shipping.exe!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x000000014ba7b8fe WindroseServer-Win64-Shipping.exe!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x000000014bfab6ef WindroseServer-Win64-Shipping.exe!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x000000007b627e49 kernel32.dll!BaseThreadInitThunk()
LogOutputDevice: Error: [Callstack] 0x000000017005dca8 ntdll.dll!RtlUserThreadStart()```

Some extra context, right before the crash :
/R5/Saved/Logs/R5.log :

[2026.04.20-15.36.05:832][929] R5NetCmClient_GsStream::OnAddPlayer ... Add player ...
[2026.04.20-15.36.10:093][ 58] LogNet: NotifyAcceptedConnection: Name: GenlandiaMulty ...

[...]


[2026.04.20-15.37.22:132][217] LogNetTraffic: Warning: FNetPacketNotify::ProcessReceivedAcks - Missed Acks: AckedSeq: 5607, OutAckSeq: 5239, FirstMissingSeq: 5240 Count: 112
[2026.04.20-15.37.22:556][229] LogNetTraffic: Warning: FNetPacketNotify::ProcessReceivedAcks - Missed Acks: AckedSeq: 5924, OutAckSeq: 5607, FirstMissingSeq: 5608 Count: 61