It can’t see the 5GHz one, at all, to give it to you as an option to connect to. Even if it did, it would talk 2.4Ghz, with the right password, and the right SSID, so which else could it try to connect to? Hi there, I’m Blink, Mr XYZSSID, and I have password abc123, and I’m speaking to you on the 2.4GHz frequency. Don’t think the 5GHz one could listen to that and try to complete the handshake.
Dunno really, but I had no issue at all. That’s why I started off my reply to the OP with, “I don’t get why you’d need to”, but maybe it’s worth a shot.