There are a couple of these bugs at the moment. They wouldn't be noticed by users of Elementary OS: only users who have installed some /parts/ of the elementary suite will encounter them.
In this case, installing elementary-tweaks but not ubuntu-overlay-scrollbars (ie, non-ubuntu derivative users)
Changed title to be more specific.
There are a couple of these bugs at the moment. They wouldn't be noticed by users of Elementary OS: only users who have installed some /parts/ of the elementary suite will encounter them.
In this case, installing elementary-tweaks but not ubuntu- overlay- scrollbars (ie, non-ubuntu derivative users)