Dragging in Submacro changes receiving macro name. Is it a bug?

I've done this hundreds of times. Today when I drag a macro into another macro the receiving macro name is changing. Why?

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I think it was because the receiving macro had a "Loop Until" group in it that shared the name with the macro title. When the top action name changed the macro title changed. Had never noticed that "feature" before. I can manually correct the macro title.