2.4 kit tap/filament sensor issue

[plucky chasm]

Hello,
I am currently finishing the construction of the formbot kit (almost no problems apart from my inexperience), it has m8p board with cb1, sb2209 rp2040 canbus and printed tap.

I ran a series of tests on the printer elements, stepper motor, x/y endstop, led, fan, heater (bed and toolhead) and everything is ok.

But, when I tested the tap, it does not work, the sensor status LED changes correctly from red to blue when I raise the toolhead, but klipper does not receive the information and remains open.

Finally, the filament detector works completely randomly (look at video). Changing from open to close continuously.
I tested the continuity of the sensor, it works perfectly, so this makes me think of perhaps a problem on the canbus side?

the two sensor are on the same pin on the canbus => gpio21/22 (on the probe pin)

I am clearly lost on the possibilities of additional tests that I can do? (I'm not an electronics expert)

Any helps is greatly appreciate !

[dry cave]

I had the same issue with TAP on one of my builds. The signal pin pulled out of the connector on the board. it was getting power, but not sending signal. No clue on the filament sensor

[plucky chasm]

thanks, i did double check all the pin to be sure but it seem all connector are ok :/
for the filament, i think i found the issue, i don't explain why when triggering it by hand it didn't work but when in the print part if i push the part it stay as detected so i think the issue is with the printed part (fs is optional i can live without it for the first hours to print new part for it ^^ )