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Revit Based HydraCAD (Ribbon/Toolbar/Location)
On video about how to put in dry pendant heads, there is a routine to use spacing and layout with model groups. There was a bug that left extra vertical pipe near RNs. These extra pipes caused this error and stopped cleanup tags from working.
Update to version 24.1.009 or newer.
Update is not released yet but is planned to soon.
Alternatively, walker the pipe and temporarily hide the selection, the pipes left afterwards will be the extra pipes causing this error which can be safely deleted. Unhide your walkered system piping after this and rerun cleanup tags.