Here is the situation:
Im trying to check when a player right clicks an Ender_Eye (and check if it has my custom data and all that)

And let me preface that I'm not a new developer or anything, I just want to ensure nothing has changed from 1.19.2-1.19.3 that I'm not heretical about.

• I can trigger my event to see whats in my hands (interact event, left click) and i get the following:

  PlayerInteractEventItemStack{AIR x 0} ItemStack{ENDER_EYE x 1}

   (offhand, main hand) which is correct, the main hand contains an endereye

• i can trigger the same with a different consumable like an enderpearl and get the following:

  PlayerInteractEventItemStack{AIR x 0} ItemStack{ENDER_PEARL x 1} 

  (also correct)

Here is where the issue is:
I spend the ender pearl (right click / trigger its throw)
Ender pearl: 

PlayerInteractEventItemStack{AIR x 0} ItemStack{ENDER_PEARL x 1} 

(this reflects the pearl)

Endereye:  

PlayerInteractEventItemStack{AIR x 0} ItemStack{AIR x 0}

(this SHOULD) reflect the ender eye, but it does not.

This is my check as a snippet: so you can see what im replicating:

@EventHandler
    public void on(PlayerInteractEvent e) {
        Plugin.info("PlayerInteractEvent" + e.getPlayer().getInventory().getItemInOffHand() + " " + e.getPlayer().getInventory().getItemInMainHand());
...

and here is a gif of the situation:
as you can see the interaction reflects the pearls correctly, but does not reflect the eyes correctly.
https://gfycat.com/UnluckyPositiveCobra (you can see it in hd if you click the little hd button)

Now, i already looked around but i could have totally missed the change if you changed where this event trigger for endereyes is, but i dont think thats the prpblem, nor do I think you would change that.