For example, https://dlang.org/library/core/time/msecs.html displays wrongly "alias msecs ;" versus https://dlang.org/phobos/core_time.html#.msecs displays correctly "alias msecs = dur!"msecs".dur;" If this is intentional, I don't think it is helpful.
Probably a good idea to open this issue at Ddox's repo if you want to have any chance of this ever getting fixed.
Done: https://github.com/rejectedsoftware/ddox/issues/219
Isn't a phobos bug... Closing this.