Java Edition:Full Block Conduit

When conduits were first introduced in 18w15a to 18w20a, it was possible to attach later invalid blocks onto them, such as torches, ladders and coral.

Placement

In 18w15a and 18w20a (1.13 Snapshots) conduits where considered a full block allowing for many types of blocks to be placed upon them.^[1]

Configurations
Blocks	Sides	Top	Bottom
Torches	Yes	N/a	N/a
Redstone Torches	Yes	N/a	N/a
Buttons	Yes	Yes	Yes
Levers	Yes	Yes	Yes
Tripwire Hook	Yes	N/a	N/a
Ladders	Yes	N/a	N/a
Vines	Yes	N/a	Yes
Snow	N/a	Yes	N/a
Walls	Yes	N/a	Yes
Fences	Yes	N/a	N/a
Glass Panes	Yes	N/a	N/a
Iron Bars	Yes	N/a	N/a
Coral Fans	Yes	N/a	N/a

Update Suppression

As with almost every block discontinued feature, most of these can also be created using update suppression. However, update suppression cannot suppress updates in the west direction, so it is impossible to "place" blocks requiring support on the west face of a conduit.