It's minor bug, but annoying.
When I copy query from Plyxon on Ubuntu 23.10 and paste to virtual machine with Windows 10 (Virtualbox with copy paste enabled and Guest Additions installed) it duplicate every line.
When I use any application as a proxy it works fine.
For example when I copy from Plyxon then paste to Sublime Text 3 and copy from there and then paste on PL/SQL Developer (or any other app) on virtual machine with Windows 10 it's works fine.