Steps to Reproduce:
Place two soul soil blocks.
Mine one with your hand and the other with a shovel.
Observed Results:
The soul soil is not mined faster with the shovel.
Expected Results:
The soul soil should be mined faster with the shovel.
Linked issues
is duplicated by 10
MCPE-65741
Souls Soil is being mined at normal (not fast) speed with a shovel.
Resolved
MCPE-68553
A bug about a soul soil, this need to be fixed.
Resolved
MCPE-68765
Soul Soil won't mine quicker, no matter the shovel or enchantment.
Resolved
MCPE-69650
Soul Soil not breaking faster with shovel
Resolved
MCPE-70724
Soil soil is mined with a sword
Resolved
5 more links
You are correct, I just tested and confirmed this bug.