Here is replay
after you TML cybran t2 mex with cybran TML (6000 damage to 3000hp building) it leave wreck with 0 mass in it (not sure about wreck hp)
but when you rebuild on top of that wreck you get 50% buiding done
also when you try reclaim it, you get no mass but it takes full time to reclaim it
and if you half reclaim it building will start at about 25%
sorry i did not test with other factions... there should not be wreck after t2 mex was TMLed
Edit, maybe it only feels long to recalim 0 mass wreck casue of other bug that were found (slow reclaim)