Hello Alexandre,
Thank you for responses, it is nice to find out about these fixes.
We do not regularly check the changelog, but the new blog has been helpful. Looking back it seems it started at 6.19 which explains why I missed the CRON change for 6.17.
We did, however, have multiple tickets about the local server CRON and had been updating less regularly because of having to apply a hack suggested by Acyba support on each update (so that our customer’s 7k subscriber campaign didn’t take two days to send).
It would have been extremely helpful had a support team member followed up with one of our tickets to let us know of the fix.