I was using lichess's analysis board for Stockfish's analysis of this line in the French:
[Title "French Defence, Steinitz Variation"] [StartFlipped "0"] [fen ""] 1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. e5 Nfd7 5. f4 c5 6. Nf3 Nc6 7. Be3 Qb6 8. Na4
Seeing as this is a familiar line, lichess already had Stockfish analysis to a deep level available in the cloud. After 7 Be3 is played in lichess, it says Stockfish (depth 41) rates 7 ... Qb6 at 0.0, giving the line 8 a3 cxd4 9 Nxd4 Bc5 10 Na4 Qa5+ 11 Nc3. But if 7 ... Qb6 is then played in lichess, it says Stockfish rates 8 Na4 as +0.6.
That's a difference of 0.6. That's much greater than rounding error. How come such a large difference? Could it be a horizon effect? If so, it's a particularly distant one! I'd have thought that analysing to depth 41 would give Stockfish plenty of opportunity to reach a quiescent position.