For some reason my toolbar customization menu is polluted with many instances of programmable buttons. I'm pretty sure that wasn't the case before and can't really figure out why it happened. It stays like this after a reboot.
Steps:
- right click the toolbar
- choose "customize toolbar..."

The issue is made worse in the picture because I'm using the "show website color" option and the UI is light on a light background.
I expect a single programmable button.
Version 0.99.133-beta (WebKit 621.1.2.111.4)
High Sierra (10.13)