Are <lastgen> circleci/* images still supported?

I know CircleCI is maintaining a new set of next-gen images at cimg/* but I was wondering if the older circleci/* images are still being maintained or if there is a timeline for deprecation of those to migrate to solely cimg/*.

For example, golang has a 1.15.12 release out and there is no circleci/golang:1.15.12 image but there is one for cimg.

I noticed the builds have been failing so it might just be permissions issue to get the automated Dockerfile updates rolling again: