Rendering midi channel ignores legato

When rendering a midi instrument (synthesizer), Renoise seems to ignore the legato of the synth patch somehow:

Original (how it should sound like, and how Renoise plays it, with legato):

http://cie-online.de/temp/rn/basslauf_original_with_legato.wav

Rendered (how renoise renders it, without legato):

http://cie-online.de/temp/rn/rendered_basslauf_no_legato.wav