Saved plans disappears

🚧 THIS IS A TICKET MIGRATED FROM UPVOTY. The original ticket and comments will be available for a limited time over at:
https://abrp.upvoty.com/b/report-a-bug/saved-trip-disappears/
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I just created a new trip and saved it in my trips. I renamed it and wanted to open it again but it is gone.
So I planned the trip again and renamed it again. Gone again.
I am using the Browser version at the moment.
Why do my trips disappear?