Hi, ernst-volny-cz
After conducting in-depth analysis, I identified some reasons, and it is not related to the error of Google Firebase. The issue stems from the value of the 'kapky' field (in field item ID 439), which was changed from 9 to 2. Many articles were saved with the field value 9. Consequently, an exported Megafilter file will retain old data, causing this error.
To resolve this, please install 'plg-content-megafilter' for bug fix.
If you also wish to apply the new update in the 'Typ' field (ID: 439), you will need to save all articles that had the 'kapky' field again to update the latest changed data in field ID 439. Alternatively, you can change the value of 'kapky' from 2 to 9, restoring it to the original data.
You kindly check and response to us.
Regards,
Vangogh