Thanks for your answer.
I cannot report an issue because I cannot connect on Gitlab. I tried to suscribe with different email addresses (professional and not), but all were rejected.So I posted several times without any answer except people who meet the same problem:
https://community.e.foundation/t/problem-esim-and-physical-sim-on-fp4/60822/3
https://community.e.foundation/t/sim-physique-et-esim/65850
https://community.e.foundation/t/feedback-for-v2-6-3/64267/348
I know that we “mobile data” is only with one SIM. But I cannot access Internet. And I cannot phone as well. As far as I switch on the 2 SIMs, I lost all connexions. So, when I leave my home or my office (where I can connect to Wifi), the only way to phone or to connect internet is to switch off one of the two SIM (and of course, I miss some calls, or I forget to switch on again). Sometime, I can bring with me an 4G key and connect to Wifi with this device.
The 2 carriers are on the white list you fill: Bouygues for physical SIM and Free for my private one (eSIM). I live in France.
I always defend free software and never use Google, Microsoft, Apple, etc. but 8 months is starting to be a long time. 
Thanks for your help.