Implausible reading by the Filament sensor inside the extruder, while loading a filament. The filament shouldn't be in the extruder yet but is detected there anyway.
Remake the IR filament sensor calibration (MMU3, MMU2S) [進行中の翻訳].
Open the extruder idler and make sure that there is no leftover filament in the extruder causing the sensor to trigger too early.
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