Multiple instances get "Already running" error after upgrades to 2021

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I run multiple, independent instances of IntelliJ, setting different "idea.config.path" and "idea.system.path" values in idea.properties. I updated one instance and everything worked fine, but when I updated by second instance, the start script apparently wants to start the same instance as the first, giving me an "Already running" error.

I can see that I'm getting the proper bin home when I add "echo $IDE_BIN_HOME" to the start script.

How can I make these totally independent now?