@kacperifs as far as i remember it was like that earlier, but due to performance issues while getting the total attachment counts, the page was slow to load the data. Unfortunately, it was removed so that it works as you stated above.

Cc @Mathias Dahl 

Hi @diwelk 

Do you know if there is any option to create SQL count select and adding amount of attachments as custom field?

That's correct. It was relatively expensive to make a count for all records in a list page in particular. The count might seem simple, but taking into account also Object Connection Transformation, it becomes more expensive.