Slime block drops RS wire when is pushed by piston

I'm sure there must be a duplicate of this somewhere but I can't locate it. It seems transparent blocks cannot be moved with slimeblocks

I could not find anything about RS and slime block.

But I what you are talking about: What do you mean transparent blocks?
Glass works good and I think is correct that barrier doesn't works.

Transparent blocks are like half blocks. Toches, dust, repeaters, etc. Blocks that need another block under it to be present.