I have the same issue. It happens in render in one level. There a lot of nanites. But didnt have this problem before. Do not change anything, just next day I’ve start to render and this is crashed:
[2023.02.12-08.52.51:464][241]LogScript: Warning: Accessed None trying to read property CallFunc_GetPlayerCharacter_ReturnValue
Landmass_test_1_C /Game/Levels/Brushify/UEDPIE_0_Landmass_test_1.Landmass_test_1:PersistentLevel.Landmass_test_1_C_0
Function /Game/Levels/Brushify/Landmass_test_1.Landmass_test_1_C:ExecuteUbergraph_Landmass_test_1:016E
[2023.02.12-08.52.51:464][241]PIE: Error: Blueprint Runtime Error: “Accessed None trying to read property CallFunc_GetPlayerCharacter_ReturnValue”. Node: Branch Graph: EventGraph Function: Execute Ubergraph Landmass Test 1 Blueprint: Landmass_test_1
[2023.02.12-08.52.54:224][242]LogWindows: Error: appError called: Assertion failed: NumSceneInstancesPo2 <= (1 << 24) [File:D:\build++UE5\Sync\Engine\Source\Runtime\Renderer\Private\Nanite\NaniteCullRaster.cpp] [Line: 1372]
The other levels is rendering fine.