It is possible observe that RH-SSO (installation with 7.4 image docker) sends hundreds of * .less 404 ERROR in the network trace (browser). This happens only in MS IE11 and IE edge.
In review, we found that after RH-SSO 7.2 (installation zip and image registry), these files are not used.
The cleaning of temporary files, cached on the server and browser was performed.
But, in the most recent version of the RH-SSO image, I still see 404 error of reference * .less files in the folders of:
NOTE: installation is from docker registry with latest image registry.redhat.io/rh-sso-7/sso74-openshift-rhel8