When I try to save the metadata, Japanese words are replaced by “?”.
I can save it in English only, but it doesn’t work in my language. I opened the kra file to see if the document XML was corrupted, but at that point it had not been converted to “?”. XML file is utf-8.
Is this a bug? Or is it a specification?
env: windows10 krita 5.2.2
Hello @4Ask and welcome to the forum 
Where are you entering and checking those characters?
I find that the File → Document Information section can store Japanese characters:
These are saved in the documentinfo.xml file inside the .kra file.
I used Google Translate to generate the Japanese characters on a Linux Mint system.
Thank you reply. Sorry for the lack of information in the image. We have uploaded an image with all the information.
I entered all the necessary information, checked the checkboxes for the output options, and exported the file. The metadata of the PNG file saved in such a way is the image in the middle. The lower right image shows the contents of the document XML in the kra file. This one was in perfect condition.
I am having trouble finding out why the embedded metadata is broken. 
Read MetaData by nomacs, ExifToolGUI
Sadly, metadata as stored in a .kra file as well as metadata exported/imported via .png and .jpg has problems.
Here is an old topic related to this:
Meta data not saved
Notice the statement by the lead developer in that topic:
In general, the metadata system in Krita is pretty old and suffers from having started out as a research project, back in 2007. I’m not surprised there are bugs…
Another:
Author's name
Another:
Exif data and how to save them as jpeg?
The manual actually suggests using an external application to view/edit metadata:
Images for the Manual — Krita Manual 5.2.0 documentation
You can view/edit metadata using Layer → Edit metadata
However, there are problems with reliable storage of it, as you have seen.
I read that topic and thought something had changed since I was able to save from time to time. The tutorial I read said to change the profile settings, so I didn’t know that ExifTool was recommended. Thank you for answering my question sincerely! it was very helpful.
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