For greater clarity, it’s an issue with Sync for Lemmy continuing to use an API parameter that was formerly deprecated and now entirely removed from Lemmy.
Sync for Lemmy is identifying a post that needs to be marked as read using a single value parameter, but it should use a slightly different parameter that could accept multiple posts.
I did not understand the issue when I first wrote that comment and posted it in the wrong place on a Sync for Reddit thread.
Nor did I fully understand the issue when I copied that comment here.
But I did figure out a few moments later when I read the referenced report.
I appreciate the clarification, as I’m sure will others.
I’ve switched back to Boost in the interim.