After a quick search, this bug looks similar, but it's for an ancient version of Django. Might still give you some hints as to where to look.
https://code.djangoproject.com/ticket/8965
If you can replicate the bug with an empty project and your template paths set, I would recommend filing a bug, although there may be some system/Django setting somewhere that can force the correct encoding/decoding that in not aware of.
Search through https://code.djangoproject.com/search and see if another ticket already exists.
-James
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