The snapshot will be captured but it will not mark it as error snapshot.
When you configure an exception to be ignored, the agent detects the exception, increments the exception count, and displays the exception in Exceptions lists in the UI, but the business transaction in which the error is thrown is not considered an "error transaction" for monitoring purposes. The transaction snapshot would not show the exception in the Summary or Error Details section and the user experience for the transaction instance would be unaffected by the exception.
More information (source): https://docs.appdynamics.com/appd/22.x/22.2/en/application-monitoring/configure-instrumentation/error-detection#id-.ErrorDetectionv22.1-IgnoreExceptionsandLogMessagesasErrorIndicators
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