I was looking over my Lock Mastery history and it looks like there isn't any overflow from completing the last task before rank promotion. If there is overflow, then training points required for my last 10 ranks were: 97,96,109,97,101,98,96,107,101,111. If there isn't overflow, tps req'd were: 92,92,93,94,95,95,95,96,97,98. It looks similar going back to rank 7.
I've had 273 tps of overflow that I know of and probably closer to 300 total or around 3 ranks worth. Why would our time and effort be thrown out the window?