Auxiliary fan switches on and then switches off again

Since the last update of Creality Print 5.1, I have had the problem that the auxiliary fan switches off when changing layers when printing. If I then turn it on again manually, the printer will turn it off again the next time the layer is changed. I then looked at the Gcode and it is output as follows when changing layers:

M106 P2 S178
;LAYER_CHANGE
;Z:2.24
;HEIGHT:0.16
;BEFORE_LAYER_CHANGE
;2.24
G92 E0
M106 P2 S0

Does anyone have a solution or know why the fan turns on and then off again?
This happens even if I use the preconfigured profile.

I don’t know the solution but I switched back to 5.0 for that

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I thought about it too, but unfortunately the Scarf joint seam function is not yet available in version 5.0.

This post can be closed. Since the last update 5.1.1.9490, the cooling has worked again as intended.