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hmm, I managed to get around this by exporting the stack to file,  manually adding `"__autonamed": true,` to the inputs for all resources, and then importing the stack again.

This all seems to be an issue when moving from version `<=0.19.0` to `>=0.21.0`. The earlier versions don't add the `__autonamed` flag, whereas the later versions require it (or perhaps end up rendering a different random suffix).