Mac OS Mojave 10.14.5 (18F132)

MacBook Pro (Retina, 15-inch, Mid 2015)
AMD Radeon R9 M370X 2 GB
Intel Iris Pro 1536 MB
Memory: 16 GB 1600 MHz DDR3

Apple Magic Mouse

Illustrator 2019 23.0.4

As per the attached video, Illustrator will deselect a layer without any click from the mouse. It will do this consistently i.e. almost every selection, which makes illustrator almost impossible to use. I have disables dictation and disabled all input sound per some of suggestions on the forum. I nothing other than Chrome opened in the background. I have 3 large files open ~200MB with a few 3D objects.

This seems to be an Illustrator 2019 issue.