What causing my plum fruit deformities?

After waiting 5 year for it to fruit, I finally got a lot of fruit on my methley plum.
But I started to see some of fruits like this, what causing this?
!(upload://680dzOva0NKGXRlveaK6SUMVPW9.jpeg)


The fruit does have plum curculio damages, but not all bug damaged fruit shrivel like this. Not sure if they are related.

This only happen on Methley(j), I have another ByronGold (E) , it doesn’t have this problem.