This has been there since the start. Because of the exporter design the textures are coupled to the mesh geometry so in order to export them the whole mesh is first prepared and then thrown away.
Open a large dataset (for example orlando, see [Link Removed] ) and export textures. It might take tens of minutes.
There's no existing public thread on this issue, so head over to Questions & Answers just mention RC-3744 in the post.