Email routes deliverability in Gmail

This is about the beta email routing feature.
Used to use ImprovMx for many domains.
While the new beta email route on CF work for some domains, the emails are not delivered to gmail inboxes for some domains.
It could be related to Gmail’s spam filters, but likely in relation to Dkim, ips and other settings you manage. The email confirmation was delivered, but the other messages are not fowarded (using alias of my domain)
Anyone experience similar issues or know a workaround?

thanks,

Just to clarify, it’s not landing in the spam inbox, it never show anywhere on gmail, but the count of fowarded email increased on Cloudflare dashboard. It’s really lost in between the two services.