Thanks for the report. Let me check again to see if I missed something.
@jrgong One of the issues I noticed is related to the color. The CSS variable in Discourse now uses shorthand color (e.g., #fff instead of #ffffff), but the lib wants the full format.
So in Watermark qrcode color
and Watermark qrcode background color
, use the full format:
I will update the TC soon.