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First of all post field of WP_Query is current post ID and not post object. But I don't think you should use it before calling the_post() method.
Normally you should do it in this way:
$args = ...
$hometeams = new WP_Query( $args );
$teamishome = $hometeams->have_posts();
while ( $hometeams->have_posts() ) {
$hometeams->the_post();
$scorehome ...
1
If you var_dump($hometeams); you will see that $hometeams->post is set to the first post in the query results even before $hometeams->the_post runs. WP_Query initializes it automatically if you have posts in the result set.
The "Undefined Property" warning occurs when your result set is empty, and thus $hometeams->post can't be set/initialized.
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