Issue saving EXIM configuration

It doesn't appear to be possible to create a global exim filter, only a .yaml one; otherwise I might be able to shift the filtering up to the account level. Re-entering 250K lines of exim filters into the cpanel GUI for account filtering... I thought that the dovecot log files might help, but they want some global config file that either exists someplace else, or that I can't access. And they seem to be binary. Sorry for the length, but I'm trying to be complete. First, I'm a lowly user. I have had a ticket with lunarpages for a bit (4427801), and they've reached out to cpanel as well (Cpanel support 9309767). I have a really large set of exim filters (250K lines), which used to work fine. When they updated to centos 7 and a newer cpanel, the exim save command within the filters stopped working. Each user has a simple redirect to the account email. The account email then uses etc/filter to deliver things appropriately, e.g. for user dog: if $h_to matches "dog" then save $home/mail/domain/dog/ seen finish endif
Previously, this would create a message in $home/mail/domain/dog/new. Now, even though "Track Delivery" happily reports success: Delivered To: /home/domain_account/mail/domain/dog/ Router: central_user_filter Transport: address_directory
There's no email. Support suggested changing to if $h_to matches "dog" then deliver dog@example.com seen finish endif
That also doesn't work. I know that it is hitting the exim filter, because I have logwrite messages, and because I have added a deliver dog@example.com line, and the email shows up there. As the system is now centos, the redhat-release bit doesn't work, and there's no centos-release, but here's the suggested status command. $ grep '' /etc/redhat-release /usr/local/cpanel/version /var/cpanel/envtype ; grep CPANEL= /etc/cpupdate.conf grep: /etc/redhat-release: No such file or directory /usr/local/cpanel/version:11.68.0.27 /var/cpanel/envtype:hyper-v grep: /etc/cpupdate.conf: No such file or directory