In “Add Tools” section for Custom Tabs, both UIGradient and UIPageLayout are named as “ViewportFrame”. No other tools seem to have naming issues like this.
Beta Features Enabled: Dragger QoL Improvements, Improved Find All/Replace, NextGen Studio Preview and UIDragDetectors
System Info: Intel(R) Core™ i5-6200U CPU @ 2.30GHz; 4 GB DDR3; Intel(R) HD Graphics 520