This is the same problem reported in #6700, which was apparently fixed but is now broken again in dune 3.7.0 (I don't seem to be able to reopen issues). Note: it does not always happen, but seems more likely after a dune clean.

Expected Behavior

dune exec should show the program's output starting on a new line, but instead it appears after the build status. It used to work correctly in dune 3.5.0.

Reproduction

$ dune init project test
Entering directory '/tmp/test'
Success: initialized project component named test

$ cd test
$ dune exec -- ./bin/main.exe
Done: 92% (12/13, 1 left) (jobs: 1)Hello, World!

Happens with both fish and bash shells.

Specifications

$ dune --version
3.7.0

$ ocamlc --version
5.0.0

$ cat /etc/debian_version
11.6