Printing added a page in version 3.0.2
I downloaded this (https://musescore.com/user/15493086/scores/3735851) score and loaded into musescore 3.0.2, telling it to do the automatic placement on conversion.
I also changed the paper size to A4.
When I looked at in in Page view it was 7 pages long. When I printed it it flowed on to an 8th page.
I was under the impression that page view should be an accurate representation.