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Http failure response for (unknown url): 400 Bad Request

Our monitoring tool shows us an error with the message Http failure response for (unknown url): 400 Bad Request with no further detailed event logs. The error occurs throughout the whole frontend application and according to logs mostly happen in production by real users on all browsers.

Could this error originate from ad blockers or browser extensions? So far, I was not successful in reproducing the error on our dev environment. What else could be the root cause of this issue?