I’m using on my FP4 two SIM cards. One physical SIM and one eSIM.
My settings Network & Internet / SIM 1 and 2 / Calls preference is “Ask every time”.
Starting a call shows a window asking me “Choose SIM for this call”. Only the number of the physical SIM card is shown while the number of the eSIM isn’t.
In my case (also FP4) it’s just the other way round: number for eSIM is shown but not for physical one.
But I’m not surprised. I’m sure (at least in my case) it’s related to the SIM itself. Number of physical SIM has never been shown on any device and any OS. Also not in SIM setting. Is it shown in the settings of your eSIM?
If you meant by setting of my eSIM: Settings / Network & Internet / myeSIM / pencil icon / SIM name & color there is no number at the entry “Phone number on SIM”. At the same place in the settings of the physical SIM there is the number displayed.