Yes i added this new info in issue #0001963
and i see today somebody opened additional bug report issue #0002184
Not much can be said or done beyond that from my side. Maybe i can offer you a workaround for files you used multiple drawing templates in it to salvage the drawings for now if you want to use latest development release. Lets assume you used multiple drawing templates A4_Landscape_plain.svg:
https://github.com/FreeCAD/FreeCAD/tree ... /Templates
Do this before you open the files.
At this location create Templates folder. In it put copies of drawing template named:
.... (depends on the number of templates you used).
After refresh all drawings should be back again. I would export them to SVG or PDF as i don't know what the fix will be in the future or if DW next will read this files without issues. If you want to export to DXF (development release) you have to do the same for corresponding DXF drawing template.