I was using whatever app launches when double clicking the lock button. I don’t think the issue was with the specific app launched, but with the system to launch it.
Please read https://grapheneos.org/usage#exec-spawning. You can choose not to use this feature if you can't tolerate up to a 200ms delay for cold start app spawning. Application spawning on GrapheneOS is as fast as the stock OS when using the standard Android app spawning system. We give users a choice.