I have a MORGT file that I downloaded from MixKit:

https://mixkit.co/free-premiere-pro-templates/hand-cursor-clicking-on-youtube-buttons-301/

I have used this extensively in the past without issue. But in Premiere 22, it doesn't render quickly in the Adobe Media Encoder. As an example, I added the above MOGRT to a blank sequence and rendered it in Premiere. This took about 6 seconds.

When I render the same 10 second sequence in Adobe Media Encoder (AME), I takes 10 minutes just to get through the first 10 frames. It is rendering. It's just painfully slow and I usually cancel.

Obviously the workaround is to use Premiere to render, but I like to queue up my sequences and render them together in AME.

It is not all MOGRT files. I have created a few of my own and they render fine in AME.

I'm on a PC with Premiere V22.1.2 (build 1).
AME 22..1.1 (build 25)