Thanks for getting back to me Simon.
I'm trying to load alert filters via a config file, but I don't see them in the UI under Tools/Options/Global Alert Filters.
Yet when I look at zap.log it looks like they are loading.
I've attached my config with the alert filters and an excerpt from zap.log
I'm using zap 2.8.0 on MacOS.
This is the command I'm using to start zap:
/Applications/OWASP\ ZAP.app/Contents/MacOS/OWASP\ ZAP.sh -configfile ~/zap_config