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Made a short video to illustrate the bug( maybe?):
Thanks to your problem I found the solution to my problem. I drew multileaders in model space and in paperspace the arrows are displayed but not the text. So my guess is it that text itself is only 2D defined in BricsCAD, but because it was set to conceptual(3D) it is ignored by paperspace and not displayed.
Could be a bug. Not much help to you I guess, but thank you for your post. It helped me greatly.