It might be linked to the fact that you can't mouseover heal a person now but instead have to use their unit frame as mouseover target. It didn't error out for me but then again I was trying it on myself rofl.
Nope, mouseover ( fine ) , left click ( fine ) , right click (fine ), then on unit frame after selecting the target .. everything above worked fine and I could inspect with no problems. Perhaps another addon getting in the way ?
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