The collapse block trick makes blocks behave like sand/gravel, and free fall. If the trick is used on Redstone Ore, with a solid block Y-2 or Y-3 of the target block, it will fall and land, and sparkle as redstone ore does when interacted with.

If a non-solid block or item (lever, torch, button, slab, etc) is Y-3 of the target block, it will fall, but instead of popping to an item as all other blocks normally do, the redstone ore is voided, as sparkling redstone ore does not have a valid item to drop.

Isn't this a vanilla bug?
On Sat, Apr 2, 2016 at 10:45 PM pjfranke [email protected] wrote:

The collapse block trick makes blocks behave like sand/gravel, and free
fall. If the trick is used on Redstone Ore, with a solid block Y-2 or Y-3
of the target block, it will fall and land, and sparkle as redstone ore
does when interacted with.

If a non-solid block or item (lever, torch, button, slab, etc) is Y-3 of
the target block, it will fall, but instead of popping to an item as all
other blocks normally do, the redstone ore is voided, as sparkling redstone
ore does not have a valid item to drop.

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#171

Eeeh....sort of, but not really. It's true, that the sparkling Redstone ore not "popping" to an item entity, is due to vanilla not having an item drop set for it . But in vanilla, no blocks would ever be affected by gravity, except for sand and gravel, so Mojang wouldn't have considered this situation when coding falling blocks and/or Redstone ore.

Being that Redstone ore is a special case when dealt with by the mod function (possibly the only one), it needs special treatment.

I recently was thinking about this, and remembered that the "Collapse Block" trick is basically doing the same function the "Mana Lens Weight" does, which does behave correctly on Redstone Ore. Well, after testing, I learned something. Specifically, on "redstone_ore" ID 73, they both work fine. Neither one actually works on "lit_redstone_ore" ID 74. So it's necessary to wait for a Block Tick, and the redstone ore to un-light, before dropping it with either a Collapse Block spell, or a Mana Spreader/Blaster with the Weight lens attached.

Or, for maximum user friendly-ness, when either a Weight mana-burst or a Collapse Block Trick affect a Lit Restone ore block, swap it for a Redstone Ore, THEN drop the block.

What about lit Redstone Lamps?

Does this also apply to them?

Yes, since they don't have an item form. Don't think there are any others like this in vanilla, although I may be wrong.

There are furnaces too, but as long as TEs are not allowed it's fine.

This is how 1.9.4 botania does it, if that matters https://github.com/williewillus/Botania/blob/MC19/src/main/java/vazkii/botania/common/item/lens/LensWeight.java

The collapsing itself is not what triggers the redstone block changing, it's when you right click on it.