Created attachment 164710 [details] An example where the bug can be caught. Warning "Text contrast is too low" arises when trying to export a document containing a hyperlink with "Universal Accessibility (PDF/UA)" as PDF, despite the text is contrast enough.
Ivan Stefanenko committed a patch related to this issue. It has been pushed to "master": https://git.libreoffice.org/core/commit/061394b6dfb8b2bcf6a2d4485751eb7443a8c081 tdf#136144: Initialize background colors to COL_AUTO It will be available in 7.1.0. The patch should be included in the daily builds available at https://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More information about daily builds can be found at: https://wiki.documentfoundation.org/Testing_Daily_Builds Affected users are encouraged to test the fix and report feedback.