I have just had something unexpected happen whilst testing LO 2020.
I created a drawing in SU that had text in it (I normally only apply text in LO). When you import the system defaults to a raster image. In that rendering everything looks well. But when I changed to Hybrid to give a sharper definition, one piece of text randomly disappeared (although the arrow is still there). Everything is untagged in the drawing.
Any idea what is going on?