Link error triggered by `dub test` but not by `dub build --unittest`

[Per Nordlöw]

On Tuesday, 16 June 2020 at 12:21:26 UTC, Per Nordlöw wrote:
> when
>
>     dub test
>
> doesn't?

I'm trying to reduce it through

     dustmite phobos-next "dub test 2>&1 | grep -F 
'_D6object10_xopEqualsFMxPvMxQeZb'"

Is this the best way to use dustmite in this case?