Taking example from today, PR #5512, only 8 builds appear on the dashboard. 7 have PR number in the name, and all 8 have branch name:

Most important in this case was that information for the failing build, macOS-x86_64-rosetta, do not appear on the dashboard, despite the log claiming it was submitted.
It looks like only the Azure builds appear on CDash.
Taking example from today, PR #5512, only 8 builds appear on the dashboard. 7 have PR number in the name, and all 8 have branch name:

Most important in this case was that information for the failing build,
macOS-x86_64-rosetta, do not appear on the dashboard, despite the log claiming it was submitted.It looks like only the Azure builds appear on CDash.