Unable to install plugins

Not seeing the install plugin button on plugin store available page,

I checked 4 instances of Jenkins V2.260, V LTS, 2.240 etc

When I am hitting available plugins page I am seeing the below error

2020-10-06 16:35:37.344+0000 [id=13] WARNING h.i.i.InstallUncaughtExceptionHandler#handleException,2020-10-06 16:35:37.344+0000 [id=13] WARNING h.i.i.InstallUncaughtExceptionHandler#handleException,org.apache.commons.jelly.JellyTagException: jar:file:/var/jenkins_home/war/WEB-INF/lib/jenkins-core-2.260.jar!/lib/layout/isAdmin.jelly:28:21: <d:invokeBody> java.lang.StackOverflowError,

Attached Images and full log

Update Site link: https://updates.jenkins.io/current/update-center.json and https://updates.jenkins.io/update-center.json (Tried both)

Tried spinning up a new VM and started Jenkins and seeing the same issue.

I have not tried downloading the plugin offline and installing it, I know this will be an alternative.