I think the issue is with the 1st party extension approval. For these notifications their visibility is reduced and thus they're not send out. I don't know an immediate fix, but this definitely needs to be looked into and resolved.
If you want to commission this work, I can open a bounty on this, but the requirements would be rather vague as we don't know the exact cause yet. What do the others think?
@SychO @davwheat @askvortsov etc?
PS my apologies @meihuak for ignoring this, I knew this was an issue and should have responded sooner.