Codeql action unable to build .NET project randomly

[alexaka1]

I have recently updated my project to CodeQL v4 action: alexaka1/distroless-dotnet-healthchecks#837 and as part of CI, CodeQL action ran successfully: https://github.com/alexaka1/distroless-dotnet-healthchecks/actions/runs/18435151787?pr=837

However a few days ago all of CodeQL runs are failing eg: https://github.com/alexaka1/distroless-dotnet-healthchecks/actions/runs/18507573818?pr=857

So I have tried to add manual build steps according to the docs: alexaka1/distroless-dotnet-healthchecks#862
However CodeQL is still failing! https://github.com/alexaka1/distroless-dotnet-healthchecks/actions/runs/18557037290/job/52896877729?pr=862

I do not know what I am doing wrong, or why suddenly CodeQL started to fail even on the same codebase that has successful CodeQL runs in the past with this very version.

[mbg]

Looks like the same issue as in #3207 (which is the last issue reported before this one); see my reply there

[alexaka1]

Thanks! That issue is for on macos specifically, so it felt appropriate to create this issue as a separate one.

[mbg]

That issue is for on macos specifically

I think that just happened to be where the problem manifested for that user. We had yours and another report of the same problem on Ubuntu. As far as I can tell, it is due to .NET 10 rc2 in both cases and there's nothing different between macOS and Ubuntu.

In any case, what I wrote there about .NET 10 not being supported yet applies either way. Our team that looks after C# is aware that something broke between rc1 and rc2 and will look into that as part of their work on adding support for .NET 10.