Filament Runout Sensor False Triggers

The filament sensor constantly gives false triggers during prints, resulting in failed prints. I am unable to manually duplicate the issue but it happens about every 3rd print.

No files, tests, or entry points are identified. Start by reviewing the filament sensor implementation and gathering reproduction details from the roughly every-third-print failure; done means identifying the false-trigger cause and preventing failed prints without breaking genuine runout detection.

Written by the indexing model from the issue text.