Could you try it on your own server? Just type "map pl_upward" in the console and then build a dispenser, upgrade it to level 3, and empty your metal supply (by building teleporters or a sentry or shooting with the Widowmaker), wait for the dispenser to have a full metal supply. Then jump on top of the Dispenser and look at your metal supply, it should go +120 if you have a non-Eureka Effect wrench. With the Eureka Effect you get 20% less from a dispenser, but the bug should still work. It might only work on your own Dispenser, so be wary of that.
After standing on it, empty your metal supply again then stand next to it. It should then give +60 metal. If you could record the process it would be cool, this way I can confirm if it works or not. GrampaSwood (talk) 06:57, 22 May 2019 (UTC)