How to delete a podcast episode on one device so that it is removed everywhere with sync?

I've set up Apple Podcast to sync between my two computers and my phone. It kinda works: when I subscribe to a new podcast on one device, it subscribes to it on other devices too; when an episode is played somewhere, it disappears on all devices; when I change podcast settings somewhere (play order), it syncs everywhere within seconds.

However, when I manually delete an episode on one device, it is NOT deleted on other devices. To be clear, when I manually delete an episode, I swipe right-to-left in Podcast for iOS, or use the delete key in Podcast for macOS.

I've tried manually syncing all I could, on the phone, the computer, and back. But to no avail.

My question:

• Should the manual deletion of episodes be synced, and if so, what may be the issue I encounter (taking into account that all other "sync" features seem to work)?
• If it is is normal behaviour for manual deletion not to be propagated, is there an alternative to clean-up unwanted episodes in such a way that it syncs between devices?

My software is all up-to-date: MacOS 10.14, iTunes 12.9, iOS 12.0

Thanks a lot for your help!