Managed to debug it with someone else at #nm irc. the issue was that the wifi.hidden=yes works only on commandline, in config file it needs hidden=true. seems this version strictly needs this configured, the version shipped with debian 9 did autoconnect even without hidden=true, now it needs to be added with "nmcli connection modify uuid wifi.hidden=yes" or adding line in the profile file under
[wifi] hidden=true
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