A collection of issues is currently occuring in vcpkg CI:

• osx: Packages are rebuild and uploaded although they should have a cached artifact. example, perhaps another.
  The ABI hash of the unexpected package rebuilds is unchanged. CI really rebuilds some dependencies, but doesn't rebuild the depending ports. Example: Rebuilds (unchanged) szip, giflib, some (!) boost ports, but doesn't rebuild (unchanged) hdf5, gdal which depend on the unexpected rebuilds.
• osxgeneral: vcpkg ci occassionally crashes early. example.
  Original only an osx issue. Now also on windows, [vcpkg-ci] Current CI problems #21905 (comment).
• general: CI success ("green") doesn't reflect ports failing host ports, hiding target triplet errors. Example.
• general: Upload fails regularly for some ports, in particular llvm:x64-windows. Read more.
  (llvm:x64-windows mitigated by [vcpkg-ci-llvm] Reduce llvm artifact to cacheable size #23896.)
• Crash between post-build check and upload. Read more