sap.ui.comp.filterbar - Clear of filters works in BAS but not in hosted BSP application

I have a strange behaviour in my UI5-freestyle application. It is being developed in BAS, with JS, freestyle UI5, and the backend is CDS ala RAP via Eclipse.

If i want to clear all filters inside the filterbar of my orders-table, it works only inside the bas webide.

It does not work, if I navigate using the url of the index.html of the bsp app. The browser debugging tools do NOT show any exception / error. The filters are simply not cleared. Any clue what might cause this ?

I don't know, since when, but the controls invocation of "removeAllSelectedItems() does the job.