What happens to the existing chats that a person has when we update the GPT code?

I have some existing conversations that use a version of my GPT. I see the option to edit my GPT but when I didi that in the configuration panel while building it things went badly. It developed context amnesia for al that we had done above the line where it ays GPT updated.
It’s puzzling because earlier I did an update and the conversation continued fie.

Just curious if people using my GPT will be able to enjoy the benefits of updates without it blowing away their existing work.

Thanks in advance.