https://bugs.winehq.org/show_bug.cgi?id=50733
--- Comment #9 from Zebediah Figura z.figura12@gmail.com --- Actually, maybe never mind, I think the problem is we're dropping most of the frames due to QoS (and I misread the log and thought we weren't doing that, but we definitely are). My guess is that 9c138562fe broke this (since I'm not sure what else could have), because now we're not sending QoS events serialized with samples anymore.
I don't like that explanation, though. GStreamer should be able to handle that. Could you possibly attach a log of 6.0, with the same channels (and GST_DEBUG=5 is enough)?