I can select any edges in V3 !
in preselection or post selection during the extrude function!

have you an image or a file ?

Hi Danny, I can repeat the problem over here and it looks like an unintended change in behavior from v2, I will investigate it.

For the moment for that particular thing you will need to preselect the edges you want to extrude before running the extrude command.

Thanks for reporting it!

- Michael