Rendering issues with Times New Roman and diacritics

Hello,

Can’t say i even encountered this issue in any software by using that font, or when using diacritics.

You mean for the UI after you set the font in System Settings to Times New Roman? With the system in Romanian or English, still there should be no issue with diacritics.
Maybe view that issue will help. See this:

Also please share from terminal
inxi -Fazy