Checks if this region has cross-region anchoring restrictions applied.
restricted = Region:IsAnchoringRestricted()
trueif this region disallows anchors to exist between separate hierarchies.
- Regions that are anchor-restricted cannot have positional attributes queried through methods such as Region:GetPoint() and Region:GetRect().
- Attempting to anchor a region between two or more separate hierarchies where one contains an anchor-restricted region will result in an error.