Listened this album up to disc 2, track 6 today on my phone, with LB Android scrobbling in the background.
This were a total of 26 tracks, of whom only 12 made their way to my ListenBrainz feed.
I gathered the LB Android log to see if i find anything there (attached to the issue). But the log is rather unspectacular. It contains 22 times "listen submitted" and 4 times "submission failed, listen saved" (of which two were "submitted" later, and two were still queued when gathering the log because the server was unavailable).

So it seems like LB Android at least believes to have submitted all listens. But where did the missing listens go?
Is LB Android losing the Listens between logging and submission? Or is this actually a server issue?

By the way: The logging could very well be extended to log at least the reason why the listen submission failed (e.g. HTTP status Code, Exception).