Develop: filter resets when merging photos

Hi, so I've gone through and star rated my photo and then colour coded them.  I filter them by the star rating and then by the colour I want to work on.  My issue is every time I do a HDR or a Panorama as soon as it's finished creating Lightroom removes the star and colour filter.  Which means if I'm trying to continue working while the image is creating I suddenly end up with all the photos I've filtered out visiable again interrupting my work flow.  I then have to then choose the star rating and the colour filter agin.  Is there any way to stop this? It's especially annoying when you have a heap of panoramas or HDRs to do in a row.