The bug

Scoreboard objective criteria minecraft.mined:minecraft.<double_tall_block> only increases when breaking the block spawned with /setblock, but not with double tall blocks naturally generated, grown (bonemeal on grass), or placed.

How to reproduce

1. Create your objective

   /scoreboard objectives add double_tall minecraft.mined:minecraft.<double_tall_block>
   /scoreboard objectives setdisplay sidebar double_tall
   /scoreboard players set @s double_tall 0
   

2. Place or grow the block in question then break it, the score will not increase
3. Create a half-block using /setblock, and then break it**, the score will increase

Additional Steps

1. Create a half-block using /setblock and include nbt data for half=[lower, upper], and then break it, the score will increase
2. Create a half-block using /setblock with nbt data half=lower and then use /setblock to create a half-block directly above it with nbt data half=upper, when you break this block** the score will not increase

Note: breaking both the bottom and top half have the same effect.