Autocompletion on unsaved files

[Javanmardi]

Description

Notepad++ used to autocomplete commands on text by selecting the language of text either the file was saved before or it was opened on the fly. But while updating to version 7.5.6 it is disabled. Also after selecting the proposed language (e.g. LaTeX), "Save" command won't recognize proper filetype. At the end, the described feature is not available on saved files without any filetype (but the language of text is selected).

Steps to Reproduce the Issue

1. Selecting the proposed language of text
2. Autocompletion is failed
3. Code highlighting is failed

Expected Behavior

As described Autocompletion, Code highlighting and auto-formatting on save command

Actual Behavior

None of those which mentioned above

Debug Information

Like what I mentioned there is none of the existing features in this update.
Thanks a lot for the support