Bogus "Bad current workspace (24), should be between 0 and 19" messages

I am using xfce4-session with the awesome4 window manager. When changing the workspace, xfce4-session spams

Bad current workspace (24), should be between 0 and 19

like messages (the "24" differs) when changing the workspace.

I have a dual head setup with 20 tags per head.

xprop -root reports

_NET_CURRENT_DESKTOP(CARDINAL) = 24
_NET_NUMBER_OF_DESKTOPS(CARDINAL) = 40
  • xfce4-session-4.20.3-1.fc43.x86_64
  • awesome-4.3-20.fc43.x86_64
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