Route planner button greyed out

🚧 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/route-planner-button-greyed-out/
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Cannot launch the route planner button at the bottom right. It is always greyed out.
I can chose destination, change parameters, etc but cannot calculate the route anymore