As a followup to the thread from 2022:
https://community.developer.atlassian.com/t/transactions-are-missing-again/59140/22
I have now also my first missing transaction 
The remittance advice (PDF) of October shows one transaction that is not included in the marketplace reporting API (JSON).
I already opened ECOHELP-29952, but wanted to share and get feedback if other vendors are also experiencing this.