We'll be kicking off with another branch of the main plot real soon, (which will also grant some of the wishes that were asked for at Christmas!) and we'll let you know the details at the end of the week!
the lower ranking dragons - that is to say any of them that are unnamed and do the menial have jobs/any of the summon dragons from the fanwork event - will not know anything about what's going on
they won't know about what happened with the waystone post, and if they are asked fi they remember those events/that enemy, they will tell you they do not
if a befriended dragon is pressed, they may eventually admit that they do not remember those events at all, even if they're sure they must have happened at some time
that would likely only occur if the befriended dragon's favour had been completed/they were on good terms with the character otherwise they would just remain evasive