Placing multiple Vines/Glow Lichen in the same block only drops 1 when mined

The Bug

when you place multiple vines/glow lichen in one block it only drops one when mined, whereas if you place (for example) multiple sea pickles/candles in the same block it drops the correct amount.

This may be due to the fact that the Vines/Glow Lichen loot table does not account for blockstates

NOTE: this is not a duplicate of MC-173493 as this contains more information and steps to reproduce

Steps to reproduce

1. Grab 2 Vines/Glow Lichen and some Shears
2. Place 2 Vines/Glow Lichen within the same block
3. Mine them with the shears
4.  -  Notice how it drops 1 even though you placed 2