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I had installed sqldeveloper 18.104.22.168 with jre 1.8.0_91 and don´t work. Issue ora-12705
I have other machine with sqldeveloper 22.214.171.124 and the same version of jre and work fine.
In both pc unclick nsl option in Preference -> DataBase -> NLS
If it possible you somehow used the workaround mentioned in SqlDeveloper ORA-12705 for your 126.96.36.199 installation but not for 188.8.131.52?