Based on their docs, that's ~/.config/JetBrains/<...>, right?

Deleting that folder and launching idea-ultimate again gives this:

2021-09-09 14:52:46,923 [   6869]   WARN - llij.ide.plugins.PluginManager - id redefinition ([row,col,system-id]: [2,3,"product classpath"])
2021-09-09 14:52:49,739 [   9685]   WARN - arketplace.MarketplaceRequests - Error reading Marketplace file: com.fasterxml.jackson.databind.JsonMappingException: Unexpected end-of-input: was expecting closing quote for a string value
 at [Source: (BufferedReader); line: 1, column: 81272] (through reference chain: java.util.HashSet[3097]) (file=/home/thomas/.local/share/JetBrains/IntelliJIdea2021.2/pluginsXMLIds.json URL=https://plugins.jetbrains.com/files/pluginsXMLIds.json)
2021-09-09 14:52:49,788 [   9734]   WARN - l.NotificationGroupManagerImpl - Notification group CodeWithMe is already registered (group=com.intellij.notification.NotificationGroup@4c8901b1). Plugin descriptor: PluginDescriptor(name=Code With Me, id=com.jetbrains.codeWithMe, descriptorPath=plugin.xml, path=/nix/store/igrdv5rq177dg6fd2z1id88v6wvq3z75-idea-ultimate-2021.2/idea-ultimate-2021.2/plugins/cwm-plugin, version=212.4746.92, package=null)

And the same blank window.

Different artifactories can have different content for the same version.
I've also had it happen that someone "force pushes" and changes the content of a released artifact, without changing the version number.

Different artifactories can have different content for the same version.
I've also had it happen that someone "force pushes" and changes the content of a released artifact, without changing the version number.

Different artifactories can have different content for the same version.

I've also had it happen that someone "force pushes" and changes the content of a released artifact, without changing the version number