I don't have that block to test but try zooming into the smaller block and performing a regen.
Also, this is the AutoLISP area.
Thanks for your response.
Follow the drawing for testing.
I'm looking for a solution in AutoLisp for the problem.
This drawing is inserted by a tool that allows the user to choose the unit of measure: 1.0 for millimeters, 0.1 for centimeters or 0.001 for meters.
The problem with the preview appears when the block is entered in the 0.001 scale.