Cannot open level after upgrade to 5.5

Development World Creation
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3
  1. nvidia driver: I use the studio driver already, installed the latest update as triggered by nvidia app…I
  2. Scalability set to Cinematic: No change
  3. Disable hardware tracing: done - but it was needed for lighting… So no.
  4. Use default settings on the (ASUS) video card - no RTSS or overlocking (Never had issues before, and other levels just open fine…)
  5. No post-processing volume in the level - done in project settings.
  6. No new mesh packs were added in this level, just a number of spline-based PCG’s - and these seem to trigger the error!!!
  7. Settings now is in new nvidia app , changed it there. but I didn’t see any Monitor Technology in app or Nvidia control panel…

None of these made the difference . Next, I found that Lumen and MegaLights use raytracing, you have to disable these first before disabling hardware raytracing. (MegaLights is experimental, and I have a lot of lights in my scene - is it switched on in the migration to 5.5 ??? I didn;t enable it!!)
Now the level does start - though VERY slow… But it gave me the opportunity to remove the PCG’s that seem to cause problems.
I had deleted the assets in the content browser using another level, so that may have cause the next error when saving the level:

Assertion failed: InExpectedDataPtr == &InternalData [File:D:\build++UE5\Sync\Engine\Source\Runtime\TypedElementFramework\Public\Elements\Framework\TypedElementData.h] [Line: 558]
Internal data pointer did not match the expected value! Does this handle belong to a different element registry?

0x00007fff6a91fb6c UnrealEditor-Engine.dll!UnknownFunction
0x00007ff827c498de UnrealEditor-TypedElementFramework.dll!UnknownFunction
0x00007ff827c489d6 UnrealEditor-TypedElementFramework.dll!UnknownFunction
0x00007ff827c423b7 UnrealEditor-TypedElementFramework.dll!UnknownFunction
0x00007ff7e950d6d1 UnrealEditor.exe!UnknownFunction
0x00007ff7e94f8f8b UnrealEditor.exe!UnknownFunction
0x00007ff7e95157ac UnrealEditor.exe!UnknownFunction
0x00007ff7e951589a UnrealEditor.exe!UnknownFunction
0x00007ff7e9519114 UnrealEditor.exe!UnknownFunction
0x00007ff7e952bd04 UnrealEditor.exe!UnknownFunction
0x00007ff7e952f0ba UnrealEditor.exe!UnknownFunction
0x00007ff859abe8d7 KERNEL32.DLL!UnknownFunction

Restarted with these settings - without problems.
Reset everything except scalabiliy (I will use cinematic anyway).

Conclusion: the PCG’s I use to create a forest inside a close-loop spline, and excluding areas defined by a spline, PCG on a spline and closed-loop spline interiors that I use since 5.0, cause a problem in 5.5 - see my post InstanceId must fit in 24 bits. - General / Feedback & Requests - Epic Developer Community Forums

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