@Turtle and @EthGahus I did hear back from Vincent that he can’t re-create it, but that the FP5 (and only the FP5?) has an issue with “Preinstalled Apps” confusion like this.
He indicates there isn’t enough logging in the blocker for traces to be useful, unfortunately. But he does note that the Preinstalled Apps management uses the same process as the blocker (partly due to them both needing to run at the system level not just user level). Due to this, a trial to work around the problem is “to remove blocker data (in the app itself) and reboot, then uninstall ioDroid, reboot, and install it again”.