In case that your kodi integration has a username and password to access kodi and you are using chrome as browser, this issue does not belong to kodi or Home Assistant at all.
Thanks for your response! Unfortunately I was using FireFox and also tried on Safari and Brave. All give same issue.
UPDATE: Well I forgot about the page and suddenly the art work was loaded. I guess it takes long for the artwork to load as I have a very large library. Any ideas how this can be cashed to make it load quicker?
I have a similar issue. I had Kodi 18 installed for a few years on my Shield and it automatically updated to v20 last week. Since it happened, the movie/series artwork won’t be displayed in both the library and as thumbnail of the media player entity.
Has anyone found a fix?