Strange problem with one shim on a 2010 FE450

I opened the valve cover to check the clearance on my 2010 FE 450 (125 hours).

I found too much play on the intake side, with one of the valve that had more than 0.2mm.

I removed the rocker arm and realized it was damaged, the shim as well had some marks and the rocker arm axis. Nothing really serious, but I decided anyway to change all parts.

When I started mounting the new parts, I realised, that on this valve, the shim doesn't go down as on the other 3 valves. The shim stays like 1mm higher, as if something prevent it to go in the correct position.

So fare I couldn't see anything, but I am a bit worried about this.

In the picture we can see that it's where the new shim (with the number on it) is located.

Can somebody help me?

Never heard about this modification before Jon, so basically you remove the 2 bolts and the 2 plates that are holding the cylinder head?

Hi Jon, so I removed it, as you advised!

I just sent 2 pictures to make sure I understood correctly.