Is this some kind of little sister bug?

[Pyromaniac]

Fort Frolic clearly stated that there are 3 little sisters in the level but I happened to found 4 little sisters instead, does anyone know if this is a bug or it's just a secret extra littler sister?

https://steamuserimages-a.akamaihd.net/ugc/861729391597385735/EBB3FD94091C814F93A147124332E1DBDF4800D8/

[Elder]

Don't worry it is the infamous little sister bug. In neptunes bounty, aracadia, famrers market and fort frolic, an extra little sister can be spawned. The wiki has more info but im taking it u took care of all the little sisters in posideon plaza before returning?

If so, there is a scripted fight with a big daddy and his little sister between hostile splicers. This fight is scripted to happen regardless of whether u took care of all the little sisters or not, hence the extra sister.

Be proud, took several attempts for me to get this.

[Elder]

In addition, the extra little sisters can be used for the extra ADAM. For all harvester run i would harvest all of them. Rescuing the extra little sister can bug out the gifts so i would reccommend ignoring the extra little sisters.

However the extra little sister for a rescue run doesnt count towards the *SPOILER* bad ending so u can harvest for that 160 extra ADAM without it counting towards the bad ending. Just dont try harvesting more than 1 extra little sister if ur doing a rescue run if ur looking for the good ending.