Page experience issue

Everything is ok... but still core web vitals not shows green... here is the test results:
```
Your cached AMP page needs improvement(s).
Your AMP page from origin has a good page experience, but the cached AMP page needs work. Don't fret, we have some recommendations to help you improve! However, it's rare that we see a cached AMP page fail page experience. Please file a GitHub issue so that we can take a look and see how AMP can help.
report link: https://amp.dev/page-experience/?url=https://www.shredfitny.com/d-bal-max-vs-dbulk-vs-dbal/amp/
same for all other pages too...
```
Using legacy Reader theme, everything was perfect, 1-2 weeks back some update thereafter all good urls drops to zero...

Start with the AMP page-experience report for the provided URL and compare the cached AMP page with the origin page. Investigate recent changes affecting the legacy Reader theme, then reproduce the issue across the other pages mentioned. Done means the affected cached pages recover a good page-experience result or the cause is documented with a focused fix path.

Written by the indexing model from the issue text.