Electrolyzer not producing expected amount of Hydrogen

Can confirm for [OI-234177].  I had two electrolyzers running and they didn't produce enough hydrogen to drive a single hydrogen generator half the time (should give over 200 g/s hydrogen but was much less than 50 g/s).  Unpausing and pausing quickly to sort of step forward reveals the electrolyzer preferring to place its 112 g hydrogen on the top left tile it is occupying, but it doesn't increase the amount of hydrogen there over time.

Edit: I did a quite a bit of testing of various setups.  One electrolyzer on it's own isn't too bad and gave about 60% of the amount of hydrogen you'd expect from it.  Two electrolyzers right next to each other like in the setup below gave 17.7 kg of hydrogen when fed with 1000 kg of water.  That's 85% less than the expected 112 kg of hydrogen.  Some 10% of the oxygen also vanished.

Edit: Tested in [OI-234293] and [OI-234418] and the bug is present in both of these versions with a single Electrolyzer surronded by 8 gas pumps.  I sent 500 kg of water in and got 419 kg oxygen and 31 kg hydrogen out, which is less than than the expected 444 kg oxygen and 56 kg hydrogen.

Additionally Elliephant on the Discord server proved (and I've confirmed this) that if you feed 1 kg of water to an Electrolyzer in a vacum you get exactly the expected 888 g oxygen, 112 g hydrogen.

Edited September 26, 2017 by Hornwitser
Added more test results.