[Urgent] Suddenly missing webhook problem

Hello? we are using meeting webhooks.
As far we have been sent webhooks properly,

[Problem]
However, in 2024.03.02 9:00 ~ 15:00 (UTC+9),
we didn’t have been sent some webhooks including ‘meeting.participant_left’.

[question]

  1. Cause of this problem (missing webhook)
  2. The way we can get webhook we missed

[Additional Information]
in 2024.03.01, we create another apps and register new webhook endpoint.