Kernrechtsfrage
Whether the court expert had to be recused for apparent bias due to prior involvement in the same matter.
Extrahierter Entscheid
The expert's prior participation did not create an objective appearance of bias because the addendum would be based on a new and expanded evidentiary basis and could legitimately lead to a different assessment.
Extrahierte Begründung
Prior involvement alone is insufficient; bias requires objective circumstances showing the outcome is no longer open. Here the appellate court planned to submit additional records and potentially new expert inquiries, so the expert remained able to reassess the issue impartially.