@gp27 to continue the thread from the KV room, is recursive queue sends important to what you're building or was it just an artifact of a test you were trying? Because while the current opaque error you're getting is clearly a bug, and the inconsistent depths you're getting is an issue as well, there is an extent to which the limiting of request cycles is intended and desirable (both to protect the platform from abuse and to protect users from runaway bills).