The bug

Vines, glow lichen and cobwebs are all blocks whose intended tool to obtain is shears. Cobwebs are broken much faster with shears than by hand or other unintended tools (excl. swords), however vines and glow lichen have absolutely no discernable difference in speed when broken by hand or an invalid tool vs. being broken with shears.

Expected behaviour would be that shears break them even just slightly faster.

Note that this ticket explicitly concerns unenchanted tools.