Cannot change load percentage

🚧 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/changement-de-pourcentage-de-charge-impossible/
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It's impossible to force the load to 80%, e.g. at an intermediate stop on a route with several stops.