Not working with 4.9.8

I have done everything possible to get this plugin to filter my custom answers by parent post (question ID), but it has totally failed. Here https://idiscuss365.com/wp-json/wp/v2/answer?filter%5Bmeta_key%5D=question&filter%5Bmeta_value%5D=4441

I went ahead and created a custom endpoint that displays all content including parent IDs, which in this case are called “question”, and still, when you enter: https://idiscuss365.com/wp-json/app/v1/answers?filter%5Bmeta_key%5D=question&filter%5Bmeta_value%5D=4396

All answers, without filtering out those with question ID 4396 show up. Please check this link.

I really appreciate your help on this. Thanks!

The page I need help with: [log in to see the link]