ServerDataSource multiple data requests on initial rendering when filter colls are set

I have ServerDataSource on table with multiple columns and filter: true option set on all of them.

On initial page render emitOnChanged 'filter' is called once for every column with filter:true + 1 call that is intended I guess, even tho all filter values are empty. That causes multiple get data requests that are not needed.

Filtering after initial render render when typing filter values works good.

Is this intended behavior and how to avoid it?