Trying to print this layout which is sized at 34"x44" (ANSI E) within ArcGIS Pro 2.8.3.

But when using Export Layout to a PDF on a local drive using default settings, my PDF looks like this:

When my coworker does the same at ArcGIS Pro 2.6.x using a project package I exported, it prints without issue and looks as expected. Can anyone confirm whether this is a bug with 2.8.x?