Tried what you suggested in a new Doc and it still doesn't work, even without empty paragraphs and even when using default styles..

I removed all empty paragraphs

this still happens
43111df51276fcc31cd2474a684161dd.png

made a new style just for that purpose
bab4d7536c6642a0470ad15d5bae96cd.png

and removed the formatting for "Normal"
905b9f5b91e6751755e722f8d67c66df.png