`dune runtest --force` does not work for `(mdx)` stanza

[redianthus]

Hi,

I have the following dune file:

(mdx
 (libraries owi)
 (deps
  %{bin:owi}
  (file primes.c)
  (file primes2.c)
  (package owi))
 (files eacsl.md))

Running dune clean && dune runtest . works but dune runtest --force . does not trigger the tests again...

This is with dune.3.20.2 and using (mdx 0.2) in dune-project.