Cannot destroy() hostile spawn

[tynstar]

After I respawned on my private server, my old spawns were changed to the owner Screeps. When my code claimed one of these room again and then tried to destroy() the old spawn, I got ERR_NOT_OWNER - however, when I clicked "Destroy this structure" in the UI, the spawn was destroyed. This looks like a bug to me.

[artch]

Duplicate of this report.