Redefine Block on Tool Palettes

If the block definition changes is insert by Tool Palettes, it does not affect the same block in the Tool Palettes
To update the block definition in Tool Palettes to match the block in the drawing

Right-click on the block > Redefine

Open Block by Block Editor

If a block open in Tool Palettes by Block Editor, any changes make and saved will automatically update in both Tool Palettes and active drawing