Please let's carry on the discussion without getting angry.
If a clone modifies any of its properties, that property becomes separate from its parent's property. This applies to sprite-local blocks, sprite-local variables, and things like x position, y position, etc. Conversely, you can use the INHERIT block to couple any property to the sprite's parent.
This is not true in general. Whatever you do to the parent happens to all the clones. But if you change something in a clone, that property becomes separate from the rest of the family.
The reason it doesn't seem that way to you is that you're modifying a costume, not a sprite. The list of costumes (the wardrobe) of a sprite is shared with its clones, so a costume in a clone is the same costume as the parent's costume, not a copy. One way to copy a costume is
You can make a list of such copies and then replace the clone's wardrobe with that list.
But this whole question about costume centers, while a perfectly valid thing to ask for, isn't really relevant to this thread. And I believe you've already requested it in its own thread, where it belongs!
Ok, but I didn't really ask how to set the center of a costume. I didn't get my answer in the other thread, which is why I asked for it to be a feature.
Shouldn’t here be a separate beta testing environment, then? Thus it will be clear to all if they are invited to post bug reports (and help the developers to fix bugs before general release).