Three long ChatGPT chats vanished in three days

I’m a Plus user and three long form chats have become severely truncated within a few days, ie. I had long history, and when i tried to redo, edit latest, the chat truncated all the messages in between and only the last message and first one or two remained.

Two were in Projects, one was a normal chat. All three were heavily image generation based, with many retries, edits.

If I search some phrases from the vanished section, ChatGPT Search shows the correct chat. But opening the chat only shows the earlier portion. Same on Android and web.

I did not delete the chats or edit old messages before this happened.

All three happened while editing a prompt.

Has anyone had the same issue?