`fdroid update -c` should complete the whole process as `fdroid update` does

From a bug report to me via email:

While putting out the first update to our F-Droid repo, I encountered one last(?) niggle: apkcache.

I put the new APK in the repo directory, re-ran fdroid update -c; fdroid server update, and... the new APK uploaded, but index.xml wasn't updated -- so the version number was still old, etc. After digging around I found out that tmp/apkcache was being used to retrieve APK metadata, so it wasn't being pulled from the new APK file. Using fdroid update -c --clean sorted it out.

But... that seems like undesirable default behaviour?