I’m not sure if you realize what’s going on here. Have you actually not noticed that it is simply deleting it’s own replies?
It happens after just a few messages.
Example:
Me: Perform task please.
ChatGPT: of course! here is the result
Me: perform task 2
ChatGPT: of course, here is task 2!
Me: How about this 3rd task?
ChatGPT: Of course! Here is task 1 
For Task 2 you can do xyz.
Task 3 is more difficult here is the plan:
bla bla bla.
At this point if you just reload your page, you will see that The system believes you have simply sent it 3 instructions in one single message. Unless you reload the page, you will never see this, but the replies from ChatGPT are basically streamed to the browser but never saved to the database.
I canceled my ChatGPT subscription today and signed up for Claude 3 Pro, because GPT4 is no longer usable for me for anything other than a simple message and reply, which I can get with Copilot.
It is not perfect either and suffers from the same types of hallucinations and tendencies to overlook things as conversations get larger, but it is much better at producing large code blocks without placeholders and prompt following in general.