Incorrect Exit Code For Skipped Tests In Lower SDK Versions

[pnquest]

Describe the bug

When using what appears to be most/all .net sdks less than the latest .net 10 sdk, The dotnet test command seems to return exit code 1 instead of 8 when run against a solution with multiple test projects and one of the projects tests are completely filtered out by the condition in a --treenode-filter flag.

Steps To Reproduce

1. Install a lower sdk (this has been tested with the original .net 10 sdk release and the latest .net 8 sdk release. Using global.json to configure which sdk is used works fine for this when you have multiple installed.)
2. Make a solution with 2 test projects (I was using TUnit). Put 1 test in each test project and set different Category on both tests.
3. Run dotnet test -- treenode-filter /*/*/*/*[Category=<One of the names>]

Expected behavior

Should return exit code 8

Actual behavior

Returns exit code 1

Additional context

See original issue opened on the TUnit Repo thomhurst/TUnit#4102
Oddly enough if I also include --ignore-exit-code 8 it results in exit code 0.