Noticed it on the live stream that Sainz in the battle with Leclerc and Hamilton quite obviously used the pit entry, then drove off track to rejoin the circuit.
Heres the clip:
Heres the race directors event notes, which determines the start/entry to the pitlane
And the rules from the ISC article L.
Now I see no reason that there could be any Force Majeure on that?
Did our new Race director slip up by not even noting it? Should McLaren have protested the result on the possibility a penalty was missed?