Zero downtime update results in CSS & JS errors mid-update

Summary

Zero downtime update results in CSS & JS errors mid-update

Steps to reproduce

Follow single deployment steps at https://docs.gitlab.com/omnibus/update/README.html#zero-downtime-updates but using rpm -Uvh gitlab-ce-11.4.3-ce.0.el7.x86_64.rpm rather than apt-get or yum. Zero downtime update attempted was 11.3.0 to 11.4.3.

What is the current bug behavior?

During/after step 2 you'll see that CSS and JS files on GitLab will start having issues loading and pages will be unusable until step 3 is complete

What is the expected correct behavior?

No CSS, JS, or other issues should occur during zero downtime update