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We had:
• Merrily working CI
• Added skip preview since the CI does preview anyway
• CI skipped doing preview since it didnt detect any changes
• Up failed
• Now it assert panics on everything (preview/up/refresh) and somehow  *37* resources are missing the `id` field

Ah actually that maybe makes sense for most of them, if they're awsx

Definitely not expected that any form of `up` would lead to asserts. I suspect this issue is unrelated to the change to add `skip-preview`. Could you open an issue with details of the panic?

<https://github.com/pulumi/pulumi/issues/3626>

Let me know if theres any other details I can add

Thanks - this looks like enough to investigate. That particular outcome is very surprising indeed.  We’ll look into it. 

Also, I accidentally reproduced it by running the same CI again. Happened again.

Good to know it’s a reliable repro I suppose - if you could note that in the issue that might help diagnosing. Sorry for the trouble - but sounds like you have a mitigation for this (though cumbersome)?

No worries. Mostly just a pain to track down the cause. Added the issue to say that removing the `--skip-preview`  did get things working again (after applying the mitigation).