In MSO, the line color is different from what shows in Impress. See attachment.
Created attachment 154125 [details] MSO document
Created attachment 154126 [details] in MSO
Created attachment 154127 [details] in Impress
Regarding the color, I can reproduce it back to Version: 4.3.0.0.alpha1+ Build ID: c15927f20d4727c3b8de68497b6949e72f9e6e9e but in Version 4.1.0.0.alpha0+ (Build ID: efca6f15609322f62a35619619a6d5fe5c9bd5a) one line is white, thus considering it a regression
Bibisected to the following commit using repo bibisect-44max. https://cgit.freedesktop.org/libreoffice/core/commit/?id=08818d8a45e034ad825c7fafbb76766f106f1d1d author Matúš Kukan <matus.kukan@collabora.com> 2014-07-04 15:12:59 +0200 committer Matúš Kukan <matus.kukan@collabora.com> 2014-07-07 17:49:09 +0200 bnc#882383: Do not ignore themeOverride for charts in .pptx
Issue fixed by https://cgit.freedesktop.org/libreoffice/core/commit/?id=e6968f0485cfb2f6c941d11c438386e14a47095d @Miklos, thanks for fixing this issue
Miklos Vajna committed a patch related to this issue. It has been pushed to "libreoffice-7-2": https://git.libreoffice.org/core/commit/7046830506bd51db897289bf59f48342015ad7df tdf#127512: PPTX import: fix handling of theme overrides in the chart import It will be available in 7.2.4. 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.
7.2.4 was a hotfix release, updating target in status-whiteboard