In the case of the MF model, as there is a scanner/ADF above the exit tray, paper is caught by the tray-full detection feeler and is difficult to withdraw.
The paper hits the scanner surface, which causes the stack of paper to tip upwards at the paper exit. As a result, the feeler detects prematurely that the exit tray is full when the trailing edge of the next sheet approaches the exit tray.
To prevent this problem, the guide and feeler have been separated in the MF model, and the feeler has been changed to a moveable type.
[A]: Printer model, [B]: MF models