Unless I'm reading it wrong, this isn't a bug.
Heal is really just a way to make the item the way it was before splitting - so much so, if you perform "most" any edit, heal won't even work. So if you change volumes, that's not going to remain if it let's you heal it - this is by design and why it's called heal FWIW. If you want to force them together and keep changed item volumes, then glue is the proper method.
If you want to continue to work with advantages you had from splitting, just keep them split and/or group them with the "G" key.
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