Issue:

Why some blocks cannot be exploded by EXPLODE command?

Causes:

The block is not allowed to be exploded, because the option Allow exploding was not checked while creating the block.

Solution:

  1. Double-click the block or select the block and click the Block Editor from the right-click menu to enter Block Editor.
  2. Press Ctrl+1 to open Properties Panel.
  3. While no objects are selected, change Allow exploding to Yes in Properties Panel, then close the Block Editor.