You are right, if a PM stated assumptions has been proven to be incorrect the PM is obliged to notify of a compensation event under 60.1(17).
If you have notified the PM under 61.3 that you believe a compensation event is expected to happen then the PM is obliged to notify you that either the matter is a compensation event or not.
If the PM has notified you that the matter, his assumption being wrong, is not a compensation event then you will need to consider how to progress the matter.
If you have notified the PM under 61.3 that you believe a compensation event is expected to happen then the PM is obliged to notify you that either the matter is a compensation event or not.
If the PM has notified you that the matter, his assumption being wrong, is not a compensation event then you will need to consider how to progress the matter.