Taphandler in Texture SourceItem seem to have maximum size (too small)

I am creating an object with #Rectangle and a material with a Texture that has a SourceItem. WIthin this source Item I can add Taphandler Hoverhandler etc. However I have a special case. The size of this SourceItem is very large. approximately 16000x16000 (it works fine with rendering, performance is great) . However the input handlers only trigger if I stay within the Item's texture coordinates of roughly x: 1000 and y 500 . Going outside these areas with the mouse does not produce any events from the handlers. Is there a maximum size for these handlers? I'd expect the input to register regardless of the position within the sourceItem of the Texture