In 1.13.2, retracted pistons and glass were not considered Block Normal Cubes.
An example of how it changes gameplay:
Exit end gateways did not consider retracted pistons and glass as valid spawning positions in 1.13.2. Now they do.
What should happen:
Retracted pistons and glass shouldn't be considered Block Normal Cubes, and an exit gateway should not consider them as valid spawning locations, just like with extended pistons.
Comments 3
Since you can now use glass for towering up redstone, I think it has been changes how glass acts as a block.
This issue is extremely important for redstone around mob farms as well as other small things in the game. How can such a thing change between versions?