Sometimes villagers don't seem to recognise jobsite blocks at all- mostly it works completely normally, but other times they just don't accept their job, even after extended periods of time. Although I've only seen the bug with lecturns, due to my trading hall only needing these, I am sure other jobsite blocks would also be bugged. It doesn't seem to fix anything when restarting the server, minecraft, and also bugs in a single player world. Thank you Mojang you're doing a fantastic job!