You are mixing so much thing and makes so much non sense that I don’t really know what I can tell you…
Yatse connects to Kodi to get data, if Kodi have issues or Kodi crash or Kodi returns bad data what do you expect Yatse to do? Some black voodoo magic?
If you have an issue with Kodi 19 then open an new issue and provide necessary logs, but no I’m really sorry to hurt your feelings I won’t be able to fix your Kodi side issues, Kodi returns 404 when asking for the images it says it have, there’s ABSOLUTELY NOTHING I CAN DO about that.
And I’m also sorry to inform you that yes Kodi is full of bugs including in Kodi 18.4, but that yes updating your Kodi will fix quite a few of them …