Issues with Offline / Proxy Workflow in Premiere Productions

Hello there, seeking the collective wisdom of the crowd on this one. I’m one of a team of three editors (all remote) who are currently mid-stream on a massive doc project utilizing Premiere Productions and an offline / proxy workflow.

It’s been great so far except for a recent (and seemingly random) issue in which certain days of our proxy media (which has been carefully transcoded and attached to our raw media file paths upstream) suddenly appears offline when opening specific stringouts or selects downstream. All this despite the fact that the same media - in its respective source folders / projects upstream - appears online and plays proxies seamlessly.

It goes without saying in an offline workflow but I should quickly note that out of habit and caution, we never ever opt to offline any of the master media when opening sequences, even if Premiere prompts us with an offline list (which it tends to do).

Our rule of thumb is always to hit cancel when prompted with an offline list and simply re-attach proxies or right-click reveal in project if any clips give us trouble and still appear offline.

But even when we do this, it’s as if the timelines including the same media downstream can’t wake up or register the fact the proxies are still attached upstream.

One of our workarounds at the moment is to copy the original stringouts / timelines from the ingest media projects and paste them back into any problem projects downstream, which sometimes causes the missing clips to re-appear, but that’s an imperfect and annoyingly roundabout method to achieve what we’re trying to do.

I know proxy file path corruption is a noted issue within Premiere Productions based on my Adobe forum research but I was curious if anyone within the community here encountered a similar issue or more effective solve than our current (time-consuming) workaround.   

Any and all insight would be greatly appreciated as were nearing the eleventh hour on this project and don’t want this issue to become any more of a thorn in our side.

In terms of specs, we’re all on Macs and running Premiere Pro 2021 (Build 15.4).

Thanks in advance!