investigate why a11y score has dropped between:
![image](data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==)
it may be the scan that has a bug, it may be related to code change, it may also be related to lighthouse way of scoring.
we need to understand in any case the reason.
note: only the viz page is concerned