netplan try not honoring the bssid attribute

[Christian Herold]

We have two accesspoints using the same SSID.
Our netplan config specifying a BSSID looks like this:
 wifis:
    wlan0:
      dhcp4: yes
      dhcp6: no
      access-points:
        "aSSID":
          bssid: "aa:aa:aa:aa:aa:aa"

With a duplicated SSID the command "netplan try --config-file aFile" results in "Error in network definition: wlan0: Duplicate access point SSID 'aSSID'.
A "netplan apply --config-file aFile' is working fine.

Netplan version is 0.104 on Ubuntu 21.04.