If Player A player B player C and player D are playing the game.
when the game starts,
if the player does not choose the trump by pressing the A key,
and plays the card directly there is a bug.
the first card played is chosen as the trump. I agree with that.
example.
today what happened is.
player A played the aise of hearts.
Player B played the 6 of spades.
player C played the 7 of hearts.
Player D played the 6 of hearts.
but to a surprise Player D won the trick.
Which is wrong.
because aise gives 11 points and is the biggest card and also the trump aise should win the trick.
which means player A wins the trick.
But in this situation, when we were playing the person who played the 6 of hearts won the trick.
This happens only when the person does not select the trump by pressing the shortcut key A.
I hope you understood what i'm trying to say.

The fact that the first card played is implicitely chosen as trump is not a bug, it's a feature !

For the second part however, I'm unable to reproduce it.

Sam plays a 7 of spades.
IT's Anastasia's turn.
Anastasia plays an ace of spades.
IT's Bugs Bunny's turn.
Bugs Bunny plays a 6 of hearts.
IT's Batman's turn.
Batman plays a 9 of spades.
Sam wins the trick.
so this means the bot had no card from the spades and this happens
when everyone have the spades it never happens