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I tried the editor mode snippet tool to cut/paste on a 9 page pdf. The pdf was of sheet music, with  staff, etc. I was in the night mode and made a copy of a copy. I was able to cut the section and paste the part I wanted. The pdf has 3 layers, the snippet was pasted over a white [black] out section on the first layer where I had covered some of original staff. The problems appeared then, first, the pasted snippet was white background, black letters and second, the snippet showed up on the first copy and the original pdf also [same reversed colors on all 3 pdfs] and the snippets were non-erasable on all 3 copies. I also checked all 3 pdf's with night mode off, the colors of the snippet reversed to black background, white letters. I did this on the S7+. 
Fortunately, it's not a big problem for me, only one measure. Maybe I can fix it by doing another cut/paste with night mode off and re-do the whiteout. Otherwise I'll just re-import the pdf.