That's the beauty of working with WebDAV, also captured vividly in the above article -- any particular server/client combination feels no obligation to try and act like some "standards" prescribe, or make use of facilities available.

I might be wrong, but when I last mounted webdav from windows, it did the same dumb thing too.

WebDAV as standard? Supports. This particular combination of client and server? Who knows, good luck.