Dynamic Block Lost Visibility State

[Deginault]

I have a drawing with several dynamic blocks (over 1000 block references) with visibility states. I recently noticed that all of the blocks no longer have the option to change the visibility state (i.e. the upside down blue triangle no longer appears when clicking on the block).

If I insert a new block it comes in with the option to change the visibility state. However, the previously placed blocks still do not have the option of changing the visibilty state. Even if I update the definition of all block references in my drawing nothing changes with the previously placed blocks.

Is there an option/command to bring back the option of changing visibility states on my previously placed blocks?

[Dadgad]

Welcome to the forum.
Might you or someone else have opened this drawing with 2013 perhaps?

[hitechengineering]

You may use my Object Snap Tracking or Polar Tracking to get it corrected. Hover here and there on the Endpoints to make visibility status correct.