mtu is not set by nmcli

Hi,

We have a fleet of xavier nx and agx orin devkits.
After flashing the device, we configure the network port with a /mnt/boot/system-connections/local file:

[connection]
id=local
type=ethernet
interface-name=eth0
permissions=
secondaries=

[ethernet]
mac-address-blacklist=
mtu=8192

[ipv4]
dns-search=
method=shared

[ipv6]
addr-gen-mode=stable-privacy
dns-search=
method=auto

After reboot, this file is copied to /etc/NetworkMamager/system-connections/local and works correctly, but the MTU is not set to 8192. This used to work in previous versions.

How can we fix this?

Regards,

KC