What's MultiDBAppConfig?
Was it a lot that you didn't upgrade? 2.3.9 doesn't include changes to config system, but previous versions did. Read upgrading page on tg docs to check them all.
I suspect it might be related to changes to signature in after_init_config method or to the fact that config is now per-app instead of process wide to make easier to mix multiple apps per process. Those are all changes introduces in previous 2.3 versions that might be related to your issue
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