Hello.
Thanks for your answer.
I finally made it work.
Actually, I installed /e/ on my phone after downgrade to MIUI 12.0 which is Android 10. I had no choice at the time because with MIUI 13 (Android 12 or 13 I don’t remember) and MIUI 12.5 (Android 12) I had several issues with the installation and not a single method worked.
I tried to run it in Safe Mode and I had the same problem. I decided to experiment a little bit, so I installed Ubuntu Touch (the installation process with easy installer and the system works perfectly on the Redmi Note 9 btw). Then, I tried to install /e/ once again. It bricked my phone, but I know how to unbrick it so no problem. Then, I installed MIUI 12.5, and this time, miraculously it worked like on MIUI 12.0.
I have no explanation. But anyway, now it works.
Thanks for your help.