@gpatel-fr thanks for the revert command, I switched back to 24.04-1.3 stable.
My network was still in the "Searching" state. Full story of my experiments below.
As a summary it seems I faced tow issues: first the operator looks up do not work with network type "2G/3G/4G/5G", second I had to reset the access points to get back network connection.
For the last point, maybe the issue was the "MMS" access point which has been enabled automatically by the message app when I run a "send MMS" test.
If I understand correctly MMS cannot work for me as my network operator do not provides any more neither 2G nor 3G networks and so I should avoid to test them.
I think I'll install 24.04-1.2 next Sunday and report if it works when I do not try to send MMS.
On 24.04-1.3, I opened the Network Settings, the default preference for network types was "2G/3G/4G/5G".
Then I went to to "Provider and access point name", the Provider field value was "None", I opened it and the searching spinner was active less than a second and no operator appeared.
I tried in previous screen to select network type "2G only", look up again for providers, the spinner ran a longer time (like if it was actually searching), but result list was empty.
I switch back to "2G/3G/4G/5G" network type, run a lookup, the spinner ran less a second again and no success.
I tried a last time with "2G/3G/4G" network type as I know my provider provides 4G network, the spinner ran a longer time again and then it succeed with all local operators in the list.
I tried to select the "yallo" and my network state has changed to "Not authorized". Then I went to "Access point name" and used the button to "reset all settings of access point", I enabled/disable airplane mode and finally my phone connected correctly to the network.
To write this last sentence I opened again the Access Point Name list and I see know the "Sunrise Internet" is enabled and the "Sunrise MMS" is disabled. Before I click the reset button, both were enabled.
I think it's possible the "Sunrise MMS" access point was the real issue as my provider disabled 2G and 3G networks and because I think the MMS technology is linked to these older technologies.
Ok, I did a try to send a MMS and it seems the message application automatically enable this access point. Today when I had 24.04-2.0 I tried too to send MMS and so I suspect the connection has been lost a while after I ran this test.