When copying the length of multiple lines bug

If you have multiple lines selected (connected exploded arc segmnents or a series of lines), then if you copy the length in the entity info box, it will corrupt the lines or change one of their lengths by small and large amounts randomly.

After Length copy:

But what did your selection look like before length copy?
You need to provide more information.

I confirm this is a bug. Steps to reproduce (see animation):

  1. Draw a circle
  2. Explode its curve
  3. In Entity Info, highlight the Length value, copy it to clipboard either using context menu or Ctrl+C
  4. Left click somewhere in Model window

One vertex will be moved. This will be added to the undo stack as “Properties”, so you can undo…or redo it.

The bug is already present in version 2025, I haven’t tried an older version yet.
(Edit: also there in SU2023)

copyEI_move_vertex_bug

__

Edit:
Actually I find that not the copy causing it but the explode curve + click:

  1. Draw curve
  2. Explode curce
  3. Click

explode_curve_move_vertex_bug

can reproduce on mac version.

It’s a hidden feature for making musical notes.

Actually I find that not the copy causing it but the Explode curve + click

Added to my post above.

also, if you keep the face, then it doesn’t break.

yeah, must have skipped a step I reckon.

It doesn’t depend on that. See my first animation above, where I didn’t erase the face, but it’s still distorted.

It looks like the ability to copy the value in a read only Entity Info field was added to 2025. The vertex moving when you click back into the model space only happens in 2025 and later. I logged a bug report, SU-63553.