Cloud Filter FETCH_PLACEHOLDERS Callback Timed Out

I am seeing "Error 0x800701AA means "The cloud operation was not completed before the time-out period expired." But for FETCH_PLACEHOLDERS callback.

However, subsequent explorer navigation to the folder path with this error no longer triggers a callback to our sync engine until we fully restart everything.

It looks to me that the connection between the sync provider and cloud filter api is lost for this specific folder. Other folders still work.

Any ideas on how we should fail gracefully if we can't honor the 1-min timedout for a FETCH_PLACEHOLDERS callback request.

Reference from old conversation:

https://learn.microsoft.com/en-us/answers/questions/2288103/cloud-file-api-faq?comment=answer-12342585&page=1#comment-2836367