Unit registry does not guarantee updated remote registries after register/update.

[DivineThreepwood]

This bug has deep impact on many registry synchronization tasks!

• revert workaround in jul after fixing this issue!
  • git revert 5c6a9a00

[DivineThreepwood]

The issue is now logged if it occurs during unit registration in the mock registry. ff62a9c

[pLeminoq]

Issue is tested in a unit test and fixed with commit openbase/jul@422e6bb.
The problem was that the sync future could return before the internal prioritized observable, that updates internal remote registries, was finished.

[DivineThreepwood]

Fix already confirmed.