Custom Filter "Address" now "Unroutable"

For years -- long before cPanel added support for "+" addresses, I've had something similar to that feature via a "global" filter configured in cPanel where tbutler_anything@mydomain (regex: `tbutler_.+@mydomain`) would forward to another account where I could deal with it as I wished. In other words tbutler_anything@mydomain forwards to tbutler@myseconddomain (this is by design so spammers cannot just take off the _anything 'local_part_suffix' and get to my real box. It has worked great and I've used it with hundreds of different suffixes over a decade or more. However, it has abruptly stopped working with a recent cPanel update. Now, if I try to send mail to said "fake" address, it is returned as "unroutable." I cannot for the life of me figure out how to reconfigure exim in WHM to tell it to pay attention to the fact that a filter exists and to accept that e-mail even though there isn't a real email address at tbutler@mydomain. I tried this, which did not work: mycustomroute: driver = redirect domains = mydomain condition = ${if eq {$local_part_data}{tbutler}} local_part_suffix = _* no_verify data = tbutler@myseconddomain
How can I tell cPanel/WHM to not reject tbutler_* but to instead let the mail come in so that the filter can process it?