Thanks for your advise.
I tried with the plug causing me the more problems (un pair and pair again the plug).
I did it using the standard Zigbee option but unfortunately, the plug has been added as an Osram plug.
I recreated the flow and will keep an eye on it to see how it behave.
That’s weird that the plug is added automatically to the Osram app and even more weird the strange behavior.
If it doesn’t work, I will check if I can de-install the Osram app and reinstall all the devices as standard Zigbee devices. Unless someone has some other idea.