Sadly never have received a reply from a dev here, on slack, or via a support ticket. I'm destroying and rebuilding the room as a solution, but I'm dissapointed the problem will never get adressed.

Bug is still present. Convinced it's a backend/engine issue. https://screeps.com/a/#!/room/shard1/W15N2

Problem still persists, even after passing ONLY active energyStructures. I do pass the list myself yes:

In the output in the console you see the list of IDs that I pass to the spawnCreep function, it totals 550 energy and only contains active structures.

room.energyAvailable reports 450, which results in the engine giving me the -6 error. I'm convinced this is a game engine issue, and would love for a dev's eye on this... Room is still fully broken. Maybe destroying all the structures solves the bug, but it's a bug nevertheless.

Thanks for thinking along!

So I checked in this situation:

In this situation, this is reported by the API:

Game.rooms['W15N2'].energyAvailable
450
Game.rooms['W15N2'].energyCapacityAvailable
550

However, as you can see from the image, 450 energy is available in the extensions, and 300 in the spawn. energyAvailable, if the disabled extensions are counted, should be 750. If they are not counted, it should be 550. As all of the extensions are filled up, I'm not sure why this gap of 100 energy exists, and I cannot fill up this gap anywhere, causing my room to come to a standstill.

I think the extensions that show up as disabled might be different than which extensions are counted in the back-end? It's a really strange situation.

This problem is currently still present. Now in W15N2. https://screeps.com/a/#!/history/shard1/W15N2?t=31911200

energyAvailable results in 450, although 550 is available.

Any help on this issue?

Update 14/2/2021: The problem is occuring live in https://screeps.com/a/#!/room/shard1/W15N2

Old post:

I have a strange bug occurring in one of my rooms, W11N13 on shard1. This room has several extensions that are inactive. The rooms reports an energyAvailable of 2150, and energyCapacityAvailable of 2300. However, all active extensions and spawns are filled, which amounts to 2300. This occurred on 17/10/2020 and has lasted at least until today. It might have been present long before (I'm not that attentive).

Console log:

W11N13 FAILED -6 spawning claimer have 2150 need 2250 body["move","move","move","claim","move","move","move","claim","move","move","move","claim"]
Game.rooms['W11N13'].energyAvailable
2150
Game.rooms['W11N13'].energyCapacityAvailable
2300

State of the room at the moment this occurs, all spawns and extensions filled: (sorry for the confusing extra visuals)

Example replay where this occurs (total amount of energy is 2300): https://screeps.com/a/#!/history/shard1/W11N13?t=29948661

The result of this is that my spawn isn't spawning because it is indicating that there is not enough energy - while there definitely is. I'm assuming this problem is because of the inactive extensions in the room, causing a mismatch in which extensions are inactive somehow?