NetworkManager : sharing per ethernet needs to switch off and on

[DB]

Hello,

My Lenovo laptop is connected to the Internet trough Wifi and I need to share the Internet (tethering) trough my ethernet port (Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 10)) to a Rapsberry Pi 3. To achieve this, I setup the ethernet network with NetworkManager (sharing the link with IPV4 and IPV6 is desactivated). This sharing is configured to switch on automatically when NetworkManager is started.
But that sharing never goes up automatically. I need to manually switch off and on the ethernet link in NetworkManager and then tethering trough ethernet works fine.

There seems to be a bug in NetworkManager considering the automatic setup up of a ethernet sharing link.
Can you solve that?

PS:I made a bug report 6 months ago in r8169 module for the same trouble #1995147