Handle custom error class in error UI boundary

Hey guys, I am throwing a custom error

throw new GQLError(workout.message, workout.__typename);

throw new GQLError(workout.message, workout.__typename);

in a subpage. I then try to handle it using a error UI boundary. Everything works as expected but

const isGQLError = error instanceof GQLError;

const isGQLError = error instanceof GQLError;

inside of error.tsx is always false. I assume nextjs internally handles/wraps the error. Is there a way to get a hold of the thrown error directly in order to display different UI in case of an GQLError? Thank you in advance

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Handle custom error class in error UI boundary