Variant SF eval improves upon playing move (Horde)

This may be known behaviour for variant SF, but documenting it nevertheless.

@Toadofsky -- hope it's ok to tag you; apologies otherwise.

In the server analysis of this game, Black's eval improves from +0.9 to -3.7 on Black's move #3:

Interesting. I wonder if people download Fairy-Stockfish onto their PC (running under WinBoard or some other non-Lichess GUI) what values are provided by the engine.

@Toadofsky -- Thanks.

Tagging @ubdip / @Fairy-Stockfish in case they'd like to see this.

If I remember correctly lichess caches evaluations of opening positions to increase speed and efficiency of fishnet analysis. If this is correct then the discrepancy might be the result of using two different engines or engine versions in the cached evaluation and the rest of the analysis. In contrast to other variants on lichess for horde there is no trivial way to gauge the evaluation of the starting position, so it can differ vastly between engines.