Not sure if this is a display issue or PDF @stevebaer or otherwise…
If a picture(frame) has been split,
it no longer shows up in the vector print preview, or the printout. It does show in Raster
It does show on the SaveAs PDF preview initially but it is missing on the printout. It also disappears if you click the Rastor button then back to vector.
Modelspace or layout, the same.