Names of the files using subfiles package

Question

I was wondering if there is a way to include with the subfiles package, files (in a main tex file) that don't have english names, especially in my case greek, but generally in other languages? I have tried some things, but it doen't give an output. It only outputs όνομα_αρχείου.τεξ.τεξ which is the file's name in greek characters. The file itself is ok, I tested it with the desired preamble to make sure it works. EDIT Firstly I am using TexLive2017 (TL2017) in ubuntu 2018, texstudio. So maybe that's the problem. I am posting below a MWE.

The Θέματα.tex file (the main file)

\documentclass[14pt]{extbook}
\usepackage[utf8]{inputenc}
\usepackage{parcolumns,paracol,rotating,mdframed}
\usepackage[english, greek]{babel}
\usepackage{subfiles}
\begin{document}
    \subfile{Ε9α.tex}
\end{document}

The Ε9α.tex file which I use above

\documentclass[Θέματα.tex]{subfiles}
\begin{document}
    \chapter{Πρωτοχρονιά}
    
Αρχιμηνιά και αρχιχρονιά

ψηλή μου δεντρολιβανιά

\end{document}

I will update my TL distribution and comment if the problem is fixed.