Nevermind, it just needed some time or a refresh. It's all loaded and sound!

So, I am playing on a browser and I sometimes jump between computers and I expected my code to be saved online but I suppose it's just stored on my computer. Can I just transfer my code files or something so I can continue my work when I jump to an another computer?

I am pretty sure this is because it deletes all the creep memory that isn't attributed to any alive creep. The creep you're spawning is not alive yet, so it deletes the memory. But that wouldn't really explain why it worked correctly in the first place, without SourceRoom.

An easy but a messy fix would be adding the role, source room and such only when it doesn't have one, i.e. role is undefined or if you want creeps with no role, then add an another tag, like thisCreepGotSpawnedAndGotTagsAppliedCorrectlyOrWhatever and, again, check if it's undefined and define it if it isn't.