I'm trying to package newest version of pulumi for nixpkgs, but getting the following errors during testing:

--- FAIL: TestExpectedDelete (2.46s)
    update_plan_test.go:354:
                Error Trace:    /build/pulumi/pkg/engine/lifecycletest/update_plan_test.go:354
                Error:          Received unexpected error:
                                Unexpected diag message: <{%reset%}>using pulumi-resource-pkgA from $PATH at /build/tmp.bS8caxmTx7/pulumi-resource-pkgA<{%reset%}>
                Test:           TestExpectedDelete
--- FAIL: TestPlannedInputOutputDifferences (4.09s)
...Snipped.. but more fails with similar 'Unexpected diag message ... error'

The testing is run in a sandbox, do you have any tips on why this is failing? The

update_plan_test.go

code is a bit cryptic