I looked at this question.
Can I use Node JS 20(LTS) but use an older version of Angular 13.3.0? Reason being our Angular code base has been developed over the years, too big(complex by so many folks who are no longer here), public facing. Currently we are on Node JS version 16 and Angular version 13.3.0. We run everything in Docker container in Cloud. Very first time when I changed the Node JS version to 20-alpine and set legacy-peer-deps as true)- I just got very few errors. But the moment I started using Angular CLI 17.3.9 and changed package.json(making changes for Angular JS 17.x.x)-I am having over 4500+ errors. Around 1000+ binding NG8002 and remaining all other errors.

Upgrade is being done for compliance reason.