Sorry I'm a bit new so I'm not quite sure what the rules are regarding TRACEs, but would adding a TRACE here be an issue? I think it might be helpful for future debugging if there are any other issues with it.
Those 'rules' are somewhat inconsistent. I would say adding a TRACE here is a good idea, but not strictly necessary.
A lot of functions in kernel32/kernelbase and ntdll have no TRACEs because they show up in a +relay log. But since I am used to COM interfaces in d3d which don't show up in relay logs (+relay injects code into DLL exports, and COM interfaces aren't PE exports) I am very used to +ddraw showing me all ddraw calls, so at times I am confused when +winmm doesn't show half the winmm calls.