So i troubleshooted the problem and the problem was that the source code files weren't saved in UTF-8 format. One of the solutions is to save all files again in UTF-8 format(https://github.com/dotnet/aspnetcore/issues/21830, https://learn.microsoft.com/en-us/visualstudio/ide/how-to-save-and-open-files-with-encoding?view=vs-2022). The other way is to have unicode characters when setting the title(https://stackoverflow.com/questions/79073388/the-sign-instead-of-cyrillic-characters-in-a-net-project-running-in-docker). So both ways(I used the second one by implementing a service for it) work and after deployment the title of the application is not seen as ???. Hope this helps anyone else dealing with this or similar issue.