Old jetpack cdn images incorrectly used in gallery

I used to host images on jetpack CDN, their URL started i0.wp1.com/etcetc

Let’s say I created a mosaic OR thumbnail gallery
as we know the HTML code is just saved as a number. That number refers, I think, to the original image available at the time of creation

Later I install a different CDN. Let’s say it’s KEYCDN

Key CDN updates all regular images with the correct reference to cdn.mysite.com/blahbal/blah.jpg.webp

However. when the gallery images are displayed if i right click to discover their URL then the original jetpack image is still used.

If I edit and change the gallery and change it back, then the webp images are used.

there is also weird behaviour of featured images also not properly displaying the CDN stored image on my theme, but let’s save that one for later ??

Quesiton: How do I refresh approximately 150 galleries on my site that all incorrectly point to old, slow images. (this is a bug!)