Hello!
When I tutored Minecraft coremod writing, I found minor but funny bug in Forge.
When you are in Creative mode, when you left-click on fire you recieve "Pssh" sound in both Vanilla and Forge games. But if you are in Survival mode, fire extinguishing gives "Pssh" in Vanilla, but not in Forge!
Because I'm developing the heavy-fire-related mod, this problem is annoying me. I can fix it by myself in other coremod-part (and probably learn something new in process), but I think it will be better to fix this in Forge =-)
Tested on clean Forge 10.12.2.1147 and on Vanilla 1.7.2.