Soft returns not supported in Tagged Text (Unicode)

This looks like an Adobe InDesign CS6 bug to me.

1. Create a story containing soft returns (Shift-Enter).
2. Export to "Adobe InDesign Tagged Text" and choose Unicode encoding.
3. Place the tagged text file you just exported into a frame.
4. Note that your soft returns have been converted to hard returns.

This is not a problem when you choose ASCII encoding. Here, InDesign correctly escapes the soft returns using <0x000A>.

Does anyone know of a way to encode a soft return in Unicode Tagged Text?