Why can't I change the names of annotation layers in Blender 2.8? When I hover over an annotation layer the tool tip says "Active Layer Index. Double click to rename". However, when I double click, nothing is happening.

Is this a bug?

I use Blender v2.82.6 under Ubuntu 18.04.
There seems to be a workaround:  

Hover with the mouse cursor over the annotation layer you want to rename, press ctrl and double tap enter.

After that I was able to enter a layer name.