Reproducing CRAN check unit test issue on Windows: "Error: DLL 'vctrs' not found: maybe not installed for this architecture?"

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A CRAN package submission has produced an error running a few of the testthat unit tests and only on the Windows platform:

I cannot reproduce the issue via:

Can someone recommend a way to debug and resolve these kind of issues?

FWIW: nothing has changed in the tested pieces of code that produce the errors since the last checks which were successful and I have reasonable confidence that the tests should not be failing.

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