Nevertheless I find it absurd it's 2021 and they still have to. It's almost 30 years since the introduction of Unicode in Windows NT and NTFS, probably also close to that in Java. Pretty much every serious programming language or database supports Unicode by default today.
I believe it's a bug in some app in the toolchain as Windows file system API is perfectly capable of handling non-ASCII symbols. I always cared to avoid using non-ASCII symbols and spaces in my paths (incl. always installing almost everything to a custom directory outside "Program Files") but c'mon, how many decades do we need to develop handling these reliably?
I would also consider Windows' inability to optionally change the actual home directory name and distinguish between the user's full (display) name and their "username" (which are 2 distinct properties in Linux) "feature-bugs".