Physical SIM cannot connect to 4G network

On my iPhone I have one physical SIM and one eSIM. Both connections are active. Since the update to beta 7, my physical SIM (main line) connects always to 3G while my eSIM (secondary line) to 4G.


Before to raise a feedback request (FB7053873) I performed the following actions trying to resolve the issue:

(a) I placed the physical SIM to another iPhone (which was on the official release 12.4) and it connected normally to 4G

(b) I did several reboot (soft and hard), but without any difference (FB7053873) (physical SIM connected to 3G, eSIM connected to 4G)

(c) I did as well a Network Settings reset, again without any difference (physical SIM connected to 3G, eSIM connected to 4G)

(d) I disabled the eSIM (secondary line), but again no difference


Does any body else face the same issue?