@skaverat Hmm, that's an interesting angle. I also have had that problem with powder laundry detergent when using an old-fashioned top loader. I did eventually realize it was best to start it filling before loading clothes, but some modern machines don't let you do that anymore.
However, now I've got a front loader with a detergent tray and I've been using powder with zero issues at all. My only issue with powder is that the boxes are impossible to open without making a mess!