Fedora 41, same IP on the wired and wifi interfaces no more possible

Hi.

For years, we are using (not at the same time) the same IP on the
wired and wifi interfaces on our laptops.

For Fedora-40 it was necessary to configure NetworkManager with:

[connection-dad-default]
    ipv4.dad-timeout=0

Ref: https://fedoraproject.org/wiki/Releases/40/ChangeSet#Enable_IPv4_Address_Con...

For Fedora-41, although this option is still valid, this doesn't work
any more: when bringing up the wifi interface, the authentication and
DHCP succeed but even the gateway is unreachable: no answer to ping.

Any idea ?

Thanks.

Traces (anonymised):

nmcli --ask connection up WIFI
<snip>
Connection successfully activated (D-Bus active <snip>

ip route
default via a.b.c.254 dev wlan0 proto dhcp src a.b.c.92 metric 600 
a.b.c.0/20 dev wlan0 proto kernel scope link src a.b.c.92 metric 600

ping -c 3 a.b.c.254
PING a.b.c.254 (a.b.c.254) 56(84) bytes of data.
From a.b.c.92 icmp_seq=1 Destination Host Unreachable
From a.b.c.92 icmp_seq=2 Destination Host Unreachable
From a.b.c.92 icmp_seq=3 Destination Host Unreachable

--- a.b.c.254 ping statistics ---
3 packets transmitted, 0 received, +3 errors, 100% packet loss, time 2088ms