if I build a contraption like shown in the video below I can place little blocks (like leavers, candles, torches) through the moving block. I don't think anyone reported this already.
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This appears to be a duplicate of MC-103071, which was later marked as "Won't Fix". The developers at Mojang have decided not to fix this issue. See the parent ticket for further details.
Either what happened was that the torch really went through, or that when the slime blocks were being pulled, there was a "gap" which you put the torch through.