Mender Dashboard UI bug when moving device to group and back


Hello Friends!
Using self -hosted Mender 3.4 I encountered a bug in the WebUI.
My device is preauthorized and added to group via API call. After some time the device is available in the UI. When I move the device to a new group and than back to the old or a new group, then I see the message accepted devices couldn't be loaded. timeout of 10000ms exceeded and the UI hangs in some kind of update loop. The page is then no longer responsive. RAM usage goes slowly up and at some point my laptop is crashing. I can only close the page and reopen it.