Known. It happens rarely under very poor network conditions. Not worth fixing. It’s not exploitable because server will eventually kick you out.
Odd. Although in v.120 some stats might be wrong, “coins collected” should not be affected as far as I can tell. No solution yet.
Individual goals never had notifications.
Too messy to implement, so no.
Fixed in v.121 
Bug
Progress will not be reverted for anyone. The goals specified might be reset or automatically completed, that’s all.
My analysis shows that only those goals listed can be potentially affected. But I can’t be 100% certain.
They won’t.
It might become necessary to change the goals and/or make them easier, but I don’t envisage a scenario that would require a total reset of your quest rank.
Price fluctuations might cause this. Are these prices all from the same region in the galaxy? If you have the coordinates I’ll look into it some more.
I guess that’s possible. But there will always be cases where the countdown is insufficient, or you don’t even notice it because your attention is elsewhere.
I don’t want to create a whole slew of exceptions for zombie players. I don’t see coins being significant enough to warrant special handling anyway.
I don’t think Chiller slow-down is as adverse as Phoenix overheat when you’re enclosed. Poll is approximately half-and-half anyway, so no.
Hmm… But it works for you sometimes? How long do you have to wait until it fixes itself? Do you have to restart the game?
You can tell by the direction of the particles in the zone.