Hi IP_Kornel
As you said, we submitted an ICM when this issue came up in Feb. According to PG's feedback, the issue has been identified as a design feature and is expected in the current version. The row count now becomes max row count and might change based on the amount of items. Designers will check if an option to keep the old behavior can be introduced .
You can vote the idea and comment there to improve this feature. It is a place for customers provide feedback about Microsoft Office products . What’s more, if a feedback is high voted there by other customers, it will be promising that Microsoft Product Team will take it into consideration when designing the next version in the future. Thank you for your cooperation!
Best Regards,
Community Support Team _ Ailsa Tao