I think the telemetry that was posted earlier in the thread showed McLaren struggling a lot in traction zones.
If you compare Bahrain with Jeddah (and even Melbourne), the traction zones are nowhere near as significant. The minimum corner speeds at Bahrain were 65km/h in T1, 105km/h in T4, 70km/h in T8, 65km/h in T10 and 105km/h in T14. In contrast, at Jeddah, after T1 (90km/h), T2 (80km/h) and T27 (100km/h) there's nothing less than 140km/h.
Jeddah is a very different circuit and McLaren's traction challenges won't hurt it as much. The telemetry from earlier in the thread indicated they are around mid-pack on drag, and that will matter a lot at Jeddah.
https://mercedes-benz-archive.com/marsF ... =190181828
https://mercedes-benz-archive.com/marsF ... =189925416
Counter-inuitively, despite Melbourne being a street circuit, it's quite fast with fewer traction zones than Bahrain.