The Bug:
minecraft.used:minecraft.COMPOSTABLE_ITEM doesn't increase when placing an item into a composter.
Steps to Reproduce:
Create a scoreboard objective for tracking the use of any compostable item and set it to display on the sidebar.
/scoreboard objectives add UseAzalea minecraft.used:minecraft.azalea
/scoreboard objectives setdisplay sidebar UseAzalea
Right-click on a composter whilst holding the compostable item of your choice.
→ ❌ Notice how the scoreboard doesn't increase despite the item being used.
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Can confirm in 21w16a

Does this affect 1.16.5?