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Can't open files with geometry nodes from 2.92
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System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: GeForce RTX 3090/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 462.31

Blender Version
Broken: version: 2.93.0, branch: master, commit date: 2021-06-02 11:21, hash: rB84da05a8b806
Worked: 2.92

Short description of error
My files from 2.92 with Geometry Nodes doesn't open in 2.93 and 3.0 or open with messed up results (mostly due to Join Geometry not getting recognized) or they crash on render.

Exact steps for others to reproduce the error
Try to open the file in 2.93. It doesnt open.

Event Timeline

Richard Antalik (ISS) changed the task status from Needs Triage to Needs Information from User.Mon, Jun 7, 6:58 AM

I have checked file 5- Robo Portal Fog Version Without GeoNodes.blend and i was able to render it in 3.0.

For issues regarding opening 2.92 files, please provide simple sample file
For issues regarding rendering, please identify object(s) that cause problems and upload simplest possible .blend file.

I am not sure whether these 2 issues are related, but if they are not, make one report for each issue.

I reduced the file just to the Geometry Nodes... I took a screenshot of how hard it crashes. The CPU activity builds to the point it freezes my computer. Then I have to close it via Task Manager. :s

This is the render crash file, with only the meshes with Geometry Nodes. It renders absolutely fine in 2.92. This one finishes opening in 2.93, but the moment I hit render it starts freezing my whole computer.

Richard Antalik (ISS) renamed this task from Geometry Nodes from 2.92 breaking files (2.93 and 3.0) to Can't open files with geometry nodes from 2.92.Tue, Jun 8, 5:22 AM
Richard Antalik (ISS) changed the task status from Needs Information from User to Confirmed.
Richard Antalik (ISS) updated the task description. (Show Details)

It looks, that rendering issue is same as file opening issue - High memory usage causing crash.

I think the problem here is that 2.92 did not make instances real in some cases where 2.93 makes instances real. More specifically, 2.93 makes instances real when you have a non-geometry nodes modifier after a geometry nodes modifier. This is so that the modifier can use all the data generated by geometry nodes.
In you file, there is a subdivision modifier after geometry nodes. Making the instances real and then subdividing them will result in a huge memory consumption. I suggest you change the file in 2.92 so that it does not make the instances real anymore (one way to do this is to just remove the subdivision modifiers after geometry nodes).
This is working as expected.

A .1 iteration breaking files is not something to be fixed?

Even the one with subdivison disabled opens up with Geometry Nodes "broken".

A simple fix would be automatically disabling the subdivision on those files when opening in 2.93 and giving a warning.
Probably lots of files getting messed up without people knowing why...