The Bug:
minecraft.used:minecraft.ink_sac doesn't increase when applying an ink sac to a sign.
Steps to Reproduce:
Create a scoreboard objective for tracking the use of an ink sac and set it to display on the sidebar.
/scoreboard objectives add UseInkSac minecraft.used:minecraft.ink_sac
/scoreboard objectives setdisplay sidebar UseInkSacRight-click on a sign whilst holding an ink sac.
→ ❌ Notice how the scoreboard doesn't increase.
Can confirm