It is actually planned... as it is now, tooltips on the action bars are disabled while you are in combat, I do intend to add the unit frames to that, I just haven't gotten to it yet.
In the meantime, one solution would be to use the '/nui tooltips fixed' option which will force all tooltips to the anchor location rather than the default "owner" position... this will cause them to not overlay your unit frames while you're healing until I can eliminate them entirely
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