Good day,
Have noticed bug today with PM topic started by guest member at my site. When I invited a dummy test account to this PM, the e-mail notification for that said the invitation was from the O.P. of the topic, not the account that did the invitation. This is with current version of discourse was able to reproduce second time did the exact same thing.
With the invite to pm feature technically this seems to add people immediately, there isn’t a clear choice to be able to decline invitation although is possible for people to remove themself from PM if they know how to do that of course. Just mentioning that about if this feature is further developed that could be better to have a choice option to be able to accept/decline invitation.
With this bug can see this being a problem if someone thinks they are being invited to a talk by a completely different person other than who really did that.