The bug
A repeater, comparator or observer will not update the block in front of it if that block is non-solid. This provides another way of quasi-powering pistons.
To mods
Even if MC-109266 is WAI this is still a bug as the piston actually receives power. If Mojang do not want power going through non-solid blocks they should not actually allow those blocks to be powered which would require fixing MC-108.
Related issues
Comments
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I am pretty sure that is incorrect. In 16w43a a repeator facing into an air (or other non solid block) will power the air block, just as before. However what has been "fixed" in MC-109266 is that the air block no longer updates the surrounding blocks to let them know it is powered.
You can test it is powered by manually updating the surrouding blocks while the air block is powered.
This was clearly demonstrated in the later parts of this video: https://www.youtube.com/watch?v=2Sqxs2wQmP0
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> just as before
So the mod is right it's WAI.
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bob, that is terrible logic. If we assume that all behaviour in previous versions of the game is intended behaviour, then why report any bugs at all and why would MC-109266 be WAI, since that is a change from the last version.
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This is the same thing as MC-108, the mod is right, I didn't realise at first.
The repeater never powered the air block, it just gave an update so the piston below knew it should check it's state.
All that was removed was the block update, QC has always been there, as such this is a duplicate of MC-108.