blocks missing from scoreboard objective stat.mineBlock

Not all destroyable blocks can be used as scoreboard objectives for stat.mineBlock, including redstone dust, placed string, and flower pots.

What I expected to happen was...:
/scoreboard objectives add flowerpots stat.mineBlock.minecraft.flower_pot

would create a scoreboard objective named "flowerpots" tracking how many flower pots a user destroyed.

What actually happened was...:
error message: "invalid objective criteria type 'stat.mineBlock.minecraft.flower_pot

Steps to Reproduce:
1. open a minecraft world
2. run the command "/scoreboard objectives add flowerpots stat.mineBlock.minecraft.flower_pot"