That's not a bug.
The game asked you whether you wanted to recover the replay because it hadn't been saved properly (you probably closed the game before it was done saving) and you told it to not recover the file, so it marked the file as soon to be deleted (any "*.mcpr.del" files in the replay_recordings folder will be deleted if they're older than two days).
To get it to ask you again, rename it to end with ".mcpr.tmp" and restart Minecraft.