Kernrechtsfrage
Whether the challenge to the expert on alleged bias was timely and admissible
Extrahierter Entscheid
The objection was raised too late because the alleged ground was known well before the appeal and no prompt recusal request was made.
Extrahierte Begründung
Recusal grounds must be raised immediately once known; by submitting supplementary questions to the expert, the appellant accepted the expert and forfeited the objection.