I have tried installing the 2d extras package from unity and get this error message,
Packages/2d-extras-master/Editor/Tiles/RuleTile/RuleTileEditor.cs(310,26): error CS1061: 'ReorderableList' does not contain a definition for 'IsSelected' and no accessible extension method 'IsSelected' accepting a first argument of type 'ReorderableList' could be found (are you missing a using directive or an assembly reference?)
Im using Unity 2020.3
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