Sample Runtime example in Probuilder throws casting errors from Mesh to GameObject on importing. Refer the attached video

Steps to reproduce
1) Create a new project
2)Window > Package Manager > Install Probuilder
3) Import Runtime sample

Actual result: Errors are thrown on importing runtime sample

Expected result: No errors should be thrown on importing the runtime sample

Reproducible on:
2020.1.0b14 and 2020.2.0a16 with Probuilder package version 4.3.1

Working fine on:
2020.1.0b14 and 2020.2.0a16 with Probuilder package version 4.2.3

Environment:
Windows 10 and Mac 10.15