I also have this issue about unreachable garbage collection at the exact moment I attempt to connect a client over LAN to my Linux dedicated server.
[2024.05.22-15.37.54:875][363]LogNet: AddClientConnection: Added client connection: [UNetConnection] RemoteAddr: 192.168.1.71:55786, Name: IpConnection_2147482324, Driver: Name:GameNetDriver Def:GameNetDriver IpNetDriver_2147482421, IsServer: YES, PC: NULL, Owner: NULL, UniqueId: INVALID
[2024.05.22-15.37.54:880][363]LogGarbage: Warning: Object (Unreachable<1>) (NeverGCed) EdGraphPin_Deprecated /Script/Engine.Default__EdGraphPin_Deprecated is marked with at least one of the unreachable flags at the beginning of GC
[2024.05.22-15.37.54:880][363]LogGarbage: Warning: Object (Unreachable<1>) (NeverGCed) BlueprintGeneratedClass /Engine/EngineDamageTypes/DmgTypeBP_Environmental.DmgTypeBP_Environmental_C is marked with at least one of the unreachable flags at the beginning of GC
[2024.05.22-15.37.54:880][363]LogGarbage: Warning: Object (Unreachable<1>) (NeverGCed) DmgTypeBP_Environmental_C /Engine/EngineDamageTypes/DmgTypeBP_Environmental.Default__DmgTypeBP_Environmental_C is marked with at least one of the unreachable flags at the beginning of GC
[2024.05.22-15.37.54:880][363]LogGarbage: Warning: Object (Unreachable<1>) (NeverGCed) BlendProfile /Script/Engine.Default__BlendProfile is marked with at least one of the unreachable flags at the beginning of GC
[2024.05.22-15.37.54:881][363]LogOutputDevice: Warning:
Script Stack (0 frames) :
[2024.05.22-15.37.54:893][363]LogCore: Error: appError called: Fatal error: [File:.\Runtime/CoreUObject/Private/UObject/GarbageCollectionVerification.cpp] [Line: 439]
Encountered 4 object(s) breaking Object and Internal flag assumptions. Please check log for details.