How to use item shadowing in 1.19 using carpet fixes

To use item shadowing in 1.19, you need 2 carpet-fixes rules to be enabled.

/carpet-fixes reIntroduceInstantBlockUpdates true  
/carpet-fixes reIntroduceItemShadowing true  

reIntroduceInstantBlockUpdates - Will re-enable update suppression which is a critical part of item shadowing
reIntroduceItemShadowing - Will revert Mojang's item shadowing fixes so that it's still possible

What is item shadowing and how do I shadow items?

My Video

Fallen Breath's Video

What is update suppression and how do I do it?

Video by Sensei