Ordinary text lists under CS the Default CS. This makes a) no sense as no CS has been applied, and b) provides only a limited number of attributes and it's unclear where this filter comes from. We should omit the Default Character Style.
Shivam Kumar Singh committed a patch related to this issue. It has been pushed to "master": https://git.libreoffice.org/core/commit/4541f80e7fabf4c7d250d8d31a1ef330540c7ffb tdf#134568 Omit Default Character Styles 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.