TUYA Smart Home WiFi Switch POLUX - LED lamp pulsating when capacitor connected

I purchased the TUYA Smart Home White POLUX WiFi double switch - purchased from the LeroyMerlin shop. The switch comes with a capacitor which I connected according to the diagram. DGCX MPX 2.2 uF K xX2 275/300/310V 40/110/56/B capacitor. In the flat I have a ceiling lamp - a Led plafond. When everything is connected and the switch is lit, it causes the switched-on lamp to pulsate. When connecting a normal bulb and plugging in a capacitor, everything works fine - there is no pulsing of the light.

Please advise if I need to purchase a larger capacitor or use something - just what.

I would also like to add information that after disconnecting the capacitor from the circuit when the lamp is switched off, the leds flash - that is why the capacitor must be plugged in.

You have connected a capacitor under the L1 output and not L2. The capacitor should preferably be 220nF.

I have connected according to the diagram in the appendix. As a test I added a second capacitor of the same type, the pulsation seems to be less, but it still occurs.