tnt cannon explodes when opening world. Also when you fire the cannon the tnt projectile disappears halfway through its arc.
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The cannon blows up when I open the world; it also blow up if I select one of the two range selector buttons that are towards the rear of the cannon. When it blows up it the whole front half of the cannon disappears. Last time it did it there was only one dispenser left out of the four. Everything from there forwards is gone. When I do fire it the tnt that gets shot out never explodes, it disappears before it reaches its target.
Hmm... In fact it's nearly impossible to track down the source of problem unless the entire circuitry is shown.
Merely explaining its higher-level malfunction (like "TNT cannon blows up") is not enough, and in order to fix the bug, we have to track it down to the lowest level (like "Repeaters become incorrectly inactive if...").
The circuitry is identical to the tnt cannon featured in the official minecraft combat handbook; pg.84-87. I have checked and rechecked many times that I built it correctly. I have also rebuilt this cannon probably 6 times with the same result every time. There was one time that it didn't blow, and the only thing different was that I was located far away from the cannon when I opened the world.
Okay, thanks for your info. I can't test it myself because I don't have a copy of the handbook but devs at Mojang are very likely to have one. "Reopened".
Can you explain more specifically which part of your TNT canon is malfunctioning, or at least give us a screenshot? Currently any non-trivial redstone contraptions tend to malfunction upon reloading the world due to MCPE-14026, MCPE-13413, or MCPE-13270. The problem you are seeing may be one of these known bugs.