The bug
Scoreboard objective criteria minecraft.mined:minecraft.red_banner
(and other colors) never increases.
How to reproduce
Create your objective
/scoreboard objectives add breakRedBanner minecraft.mined:minecraft.red_banner /scoreboard objectives setdisplay sidebar breakRedBanner /scoreboard players set @s breakRedBanner 0
Place a banner of that color and break it in survival mode.
→ Notice your score has not increased
Fixed for wool in 1.13-pre3
Fixed for wool in 1.13-pre3. Beds and banner statistics still don't increase, confirmed.