rust: Tests fail with no output

Hi

I have two Rust tests, Luhn and Forth, that both passes all test locally but fails online. In both cases, the output from the test are -

To troubleshoot, I cloned https://github.com/exercism/rust-test-runner and tests runs successfully locally using the rtr docker image build with bin/test.sh (or the record, I ran the tests using ../rust-test-runner/bin/test-exercise.sh /workspaces/exercism-rust/rust/forth

(the next observations are created using the luhn exercise, but I do not think it matters)

If I provoke a syntax error in the online editor, the compilation error is shown. If I provoke a result error in the online editor, it do not get the error returned. If I switch from regex = { version = "*"} in Cargo.toml, to version 1.10.2 (the latest), the build fails and I get a message. If I use version 1.10.0, “One of the tests timed out” or the “no result” happens.

Not sure what I can do more to troubleshoot the issue.