There is a longstanding issue (noticed it over half a year ago) with RGB PDFs toggling back and forth between RGB and CMYK color modes when viewing.

When I am viewing an RGB PDF, the colorspace will randomly toggle back and forth between RGB and CMYK. This is extremely undesirable when showing designs to clients.

The issue appears randomly when zooming in on a PDF or when going back and forth between pages. I attached a video of the issue.

I am running Mac OS Mojave 10.14.5 and Acrobat version 2019.012.20034.

Expected result: my colors will display correctly
Observed result: colors will randomly change between RGB and CMYK