Here are two pictures: first one is a screenshot, second one a "real" picture which has the funny colors. The kodi log is here: https://paste.libreelec.tv/ideal-bluegill.log
I "updated" to generic-legacy where the colors are back to normal. Just during startup the libreelec splash is first shown in wrong colors. The log is here: https://paste.libreelec.tv/on-lizard.log