No. It doesn't. At all. Ever.
I'm not saying your saves weren't lost. I'm saying that is not something the game did.
I don't know what the cause is, but the game isn't it.
Don't invalidate the new ones, and besides you are probably at most doing it the wrong way or do saved it at the last page 20 in last row or as 200th and saved it t h e r e if that's not commonly easy idk what would with only ask or talk, that's all since twine were the thing's mostly at fault and can't be helped not the dev of this COT.