Plasma panel flickering


Have an interesting problem with Plasma 5.11.95.
I try and add an additional panel to the side, add folder view and pager to it, resize it and set it to autohide. Works as expected, but once it hides again it leaves behind some weird rendering issue what looks like the panel is kinda flickering. Running the proprietary Nvidia 390.25 driver.

Gif available here:

Anybody noticed issue like this?