Thank you thank you thank you for pointing out this problem... I've built so many variations of spawner in so many different places and stood at so many different heights with so many different flushing mechanisms that i was starting to lose the will to mine. Relieved to know the cause of my suffering but i despair that this issue is effectively unfixable until the devs deem it a worthwhile cause. Pleeeeeeeezzzz pleeeez pleeez fix it, i have put literally days into trying to sort this out and was so looking forward to recreating my pc world on my phone now we have pistons... But seeing as this bug is still ruining my life im not gonna bother... May look into making a redesigned spawner around this new found knowledge or i may just give up and throw my phone into the path of a passing cheese wheel and go train a pigeon.
Agreed, this isnt just a minor unnoticeable flaw, this is a game breaking problem with a fundamental mechanic of the game not functioning properly.
Mob spawners not functioning correctly may not be high on the issue list but the fact that this bug will be having huge effects on the rest of the game but it has somehow gone unnoticed and nothing is being done about it is frankly rediculous.