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I'm using legendary walls on my Nauvis base as well as on some spacecraft. I've noticed that when a legendary wall is destroyed by biters or asteroids, bots (or space platforms) replace that wall with a normal quality wall instead of the original legendary wall. I haven't noticed this inconsistency with any other legendary building. I have an upgrade planner set up that I just drag across my base/spacecraft periodically to replace all the normal walls with legendary again but there must be a better way. Why does that happen and how can I keep all my walls legendary when they get automatically rebuilt?

Are you using any mods? There's no reason this should happen unless a mod is doing it, or you've mistakenly down-graded them - or forgot and placed normal quality walls/wall-ghosts without realizing it.

I am using a few QOL mods and there is one designed to affect walls so that might be it: https://mods.factorio.com/mod/no-stone-wall-alarm

I don't place ghosts in these cases, it's only when they're automatically rebuilt by bots/platforms.

starduck wrote: Tue May 05, 2026 6:44 pm I am using a few QOL mods and there is one designed to affect walls so that might be it: https://mods.factorio.com/mod/no-stone-wall-alarm

I had a quick look at the code and yeah that's definitely it. The mod hooks the on_entity_damaged event and uses its own logic to destroy the entity and create a ghost, which fails to account for quality.