Kernrechtsfrage
Whether the cantonal nullity appeal against the refusal to recuse the expert was admissible
Extrahierter Entscheid
The nullity appeal was inadmissible because no irreparable legal harm was shown or even alleged.
Extrahierte Begründung
Under cantonal law, an incidental decision is challengeable only if expressly provided or if it causes irreparable harm; that condition was not met.