When using the HDRP package, selecting vertices via marquee on a ProBuilder object yields a random set of vertices.
This cannot be reproduces in standard Unity renderer or the URP/LWRP renderer.

Repro steps:
- download this project
- open the sample scene
- select the sphere
- go into vertex selection mode
- try to drag a selection rectangle to select the top vertices of the sphere
- notice that the vertices at the bottom get selected

There is also a video attached that illustrates this.
Cannot reproduce in 2018.4.

Reproducible in 2019.1, 2019.2, 2019.3 and 2020.1 (with their respective, latest HDRP packages)
Reproducible with Probuilder 4.1.2, 4.2.1 , 4.0.5 , 4.0.2