I have the same problem. With all existing rules, Hazel crashes when I press "Replace Text". Editing the old rules doesn't work, but the rules are executed correctly. I duplicated and recreated the rule, but every time I press "Replace Text" Hazel crashes.
/var/folders/gm/w9br5gfn1f79nvc0mntnw9y40000gn/T/2019-11-01_15-16-24.png
I use the latest macOS and Hazel version.