Invisible sound mark has collision in Sandus Ancestral Tomb

Walking by this corridor in Sandus Ancestral Tomb I was blocked by something invisible. After toggling the tcg command I could can saw that sound marker has collision.

Pix and save attached

Win 7, 64 bits OpenMW-latest-47bac137-win64 (2015-03-19)

(RM-2461 from redmine: created on 2015-03-19 by Amenophis ., , closed on 2015-05-03 by scrawl ., relates #2442 (closed))

Attachments: Sandu_invisible_marker.omwsave