Is this a bug?

So, I want to play Sim battles with the following line-up.
He-112 A-0 with BR 2.0 and Ju-87 G-2 with BR 2.7

I choose a room where the BR range is between 2.3 and 3.7. The Heinkel can’t take part in the battle, that’s ok. But why can’t I play with the Ju-87 G-2 in that battle? It perfectly fits between 2.3 and 3.7.

Furthermore, If I press take part button ( or battle start button ), shortly, I get a message that says: none of my vehicles has the necessary BR for the battle.
But that’s not true for the Stuka.