GCode issue

Hello,

On my ender 3 I am testing this GCode to Load Filament:

G21 ; Let the printer know you are following this point with metric values
G90 ; Extruder Relative Positioning
M109 S200 ; Heat hotend to 200C
M300 S880 P300 ; Play tone
G4 S5 ; wait 5 seconds
G92 E0 ;Reset the position of the extruder
G1 E420 F1000 ; Feed 420 mm of filament at 1000 mm/minute speed. Fast move.
G92 E0 ;Reset the position of the extruder
G1 E120 F100 ; Feed 120 mm of filament at 100 mm/minute speed. Slow move.
M300 S880 P300 ; Play tone
M400 ; loop until movement done

The issue that I get is that the second feed (the 120mm one) goes backwards instead of feeding forward an additional 120 mm of filmenent as requested. What I am doing wrong?

The only thing that seems odd to me is that you have the wrong comment on the G90 - that's setting the extruder to absolute mode, not relative mode. But that's what you want if you are going to be using G92 to reset the extruder position between moves. So this is a strange issue.