The v1.4.1 update is now live on the Marketplace. This is a v4.12 exclusive update & fixes a bug that arises due to event access conflict, when multiple groups of the same creep class are spawned from different enemy spawn points within the same time frame.
I haven’t yet released the v4.13 update because of a new engine bug that interrupts the wave generator workflow under certain conditions. I’m assuming that it’s caused by the registered bug ‘UE-35609’, which should be fixed in the v4.13.1 engine release. So once that’s taken care of, the toolkit will receive the official v4.13 update.