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ORA-00600 12333 usually means there was a communications error between the client and server. If you kill a session or perform a shutdown while a users connected you could potentially get this error. There's other reasons too. I think you're probably right that Oracle support will tell you to upgrade if you file a TAR with them.
Did this error crash your database or does it happen frequently? If the answer is no then I wouldn't worry about it unless the end user has said something about it. If this is a problem then I'd contact Oracle support.
I'm also running 18.104.22.168 and get maybe 1-2 of these errors a month from the same PC. In our case this error didn't correspond with a database shutdown or a killed session. We also tried reinstalling the client software and this didn't fix it either. I think our error may be because of this one PC being on a very old part of our network that probably needs upgrading.