Description of problem:
The environment variable NODEJS_VER is set to 10
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. podman pull registry.redhat.io/ubi8/nodejs-12:latest
2. podman image inspect registry.redhat.io/ubi8/nodejs-12:latest | grep NODEJS_VER=
Moving to correct product/component
@Petře, could you please take a look?
Thanks for the Vita! This is expected. The definition for the variable is actually coming from the s2i-base image  serving as a base layer for the nodejs image, which installs nodejs version 10 for layered images to use.
The nodejs-12 image specifically then removes the version 10 rpms and replaces them with version 12. 
I think the original question was answered. Because there were no further comment from OP, think it is safe to close this ticket. Feel free to reopen if there are any additional concerns.