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Attached are 2X dwg of a deliverable and the .pdf printed prior to closing the drawing.
4499-001 - The .pdf printed all the multileaders and this was from the last saved version of the .dwg before closing. When opening the .dwg all the multileaders are now invisible, I can qselect the multileaders and I can see all the hinge and insertion points, I can copy those entities into a blank template and they appear but do not appear if I copy them back into the drawing. there's a .bak from 2 minutes before the final modified time on the .dwg and that doesn't show any mleaders either.
4478-001 - I've also had similar problems with dynamic blocks where they are only present in the viewports and not the model space. The blocks can be seen in viewport "5 plan" and I could copy-paste them out of the viewport into a blank template.
These issues appear to have been happening since 28/11/19.