Some more info:
This bug affected me on a clean install of Ubuntu 20.04.
On upgrading another machine from 18.04 to 20.04 I found that I had both
xscreensaver and xfce4-screensaver installed. This caused me to have to
do a double unlock each time I wanted to wake the PC. I therefore
deleted xsc
** Attachment added: "Screenshot_2020-08-23_10-55-21.png"
https://bugs.launchpad.net/ubuntu/+source/xfce4-power-manager/+bug/1892621/+attachment/5403823/+files/Screenshot_2020-08-23_10-55-21.png
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More screenshots
** Attachment added: "Screenshot_2020-08-23_10-55-51.png"
https://bugs.launchpad.net/ubuntu/+source/xfce4-power-manager/+bug/1892621/+attachment/5403822/+files/Screenshot_2020-08-23_10-55-51.png
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** Attachment added: "Screenshot_2020-08-23_10-56-02.png"
https://bugs.launchpad.net/ubuntu/+source/xfce4-power-manager/+bug/1892621/+attachment/5403824/+files/Screenshot_2020-08-23_10-56-02.png
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