Chapter markers disappear after version conversion. With a quick solution!

Today I noticed a bug when opening an old project that I created with Premiere 2023 and found a quick solution for it. In this project I have a lot of timelines with chapter markers. These chapter markers had disappeared after converting to the current Premiere version. And in every timeline. I thought I would have to reset all the markers. Until I set the first chapter marker. After that, all markers were visible again in all timelines. Has anyone else experienced this error?