Is there a list of what is actually canon for FR?
Not a very detailed answer but I'll throw in whatever I have
A few months ago I remember seeing someone send a mail directly to WOTC to ask them which pieces of fiction that were and weren't considered to be canon. I have no way of finding this forum post again, but you're free to try if you want to put in the time.
All that I faintly remember is that the accompanying material for Murder in Baldur's Gate wasn't considered to be canon, while the Infernal Tides comic series (which had just started being released a couple of months prior to the person contacting WOTC) was considered to be canon.
BG3 spoilers
While I haven't read either of the two, the reason Murder in Baldur's Gate has been removed from the canon is apparently because it conflicts with what has happened to Minsc, who is a central character in the comic series I mentioned.
Due to data miners we know that Minsc is very likely to show up in BG3, possibly even as a party member. While I don't want to put on my tinfoil hat for this I don't think it's that far-fetched to imagine the comic is made as a sort of BG3 'prequel' to explain or justify why he's still alive after a hundred years.
