Can't get mesh bed leveling to work (no replies)

Hi I'm trying to enable the mesh bed leveling feature on my printer.
My printer is a Ender-3 patched with the latest version of Marlin (1.1.9)

I've already done it in the past on another printer, but this time I can't get it to work.

I think I followed all the procedure :

Enable MESH_BED_LEVELING in configuration.h
Enable LCD_BED_LEVELING in configuration.h

Level the bed and save to eeprom (using LCD)

Add M420 S1 after the G28 in the startup GCODE

During a print, the Z axis doesn't move to compensate the mesh data.
It's still moving when going to the next layer, but it's completely idle while a layer is printing.

I connected to my printer with pronterface,

If I do a M420 S1, the printer answer me with

Bed Leveling On
Fade Height Off

If I do a M420 V1 the saved mesh is correctly returned.
Then if I move the head around the X and Y axis, the Z axis is still idle and not compensating for the mesh.
Shouldn't the Z axis be moving ?

I attached my configuration.h and configuration_adv.h if it can help.

Anybody have an idea ?
Thanks