On the fly adding custom routes for wifi connections

Hi there! On latest Ubuntu (19.10 and 18.04 also) with installed NM 1.16.0 out of the box I found myself struggling in problem of reapplying WiFi interface changes after changing them. Here how it looks like:

# nmcli connection
NAME                UUID                                  TYPE      DEVICE          
CRY                 df20f637-e127-4f20-8bf8-b55122f4fd6d  wifi      wlxf81a6722f2a1 
Wired connection 1  c6f2b121-fc05-3e0a-b1f9-cafe800792e2  ethernet  ens33           
# /usr/bin/nmcli connection modify CRY +ipv4.routes "193.37.157.53/32 192.168.77.1"
# /usr/bin/nmcli device reapply wlxf81a6722f2a1
Error: Reapplying connection to device 'wlxf81a6722f2a1' (/org/freedesktop/NetworkManager/Devices/3) failed: Can't reapply changes to '802-11-wireless.seen-bssids' setting

In my case those commands coming quickly from external application (VPN client) and eventually end up with this error. But sometimes it just works. Judging by 'seen-bssids' mentioned, problem is probably caused by always changing wireless network environment. Some networks may become out of reach or new network can arise from nonexistence. Is there any way to deal with such kind of problem without upgrading/downgrading NM? Should it be fixed in NM?