Extensions bar gets duplicated when opening Private Window(s) (Mojave)

Steps to reproduce:

For each new Private Window, the bar duplicates one more time

Expected behavior:
Extensions icons should remain in place

Orion, OS version; hardware type:
0.99.121.1-beta, MacOS 10.14.6, MBP 13"

Image/Video:

webpsupporter Can you please show a video of this happening?

Just confirmed that this happens for new Normal Windows too

Thanks a lot!