It's a bug in conan-center CI: when the recipe is not modified, it reuses the existing binary for the test, but it does not install system dependencies. The workaround is to modify the recipe in order to trigger a new build.
This is very painful to create a fake recipe update for every commit.
What is your problem/feature request?
Issue seen when trying to do a MR on the qt package: https://github.com/conan-io/conan-center-index/pull/22151 with @ericLemanissier
This is very painful to create a fake recipe update for every commit.