Send to Telegram gets disabled by status changes

Our site has a publishing process where posts go through a publishing queue. Something in the process turns off the “Send to Telegram” setting. Here’s how the process works:

1. Post is written and saved as pending to wait for approval.
2. Editor checks the post and saves it as spq_queued, a custom status.
3. Our scheduler picks up the post from the queue, changes the post status to future and sets the post_date.

Step 3 seems to turn off the “Send to Telegram” setting. Here’s what it does:

$updated_post = array(
	'ID'            => $post_id,
	'post_status'   => 'future',
	'post_date'     => date( 'Y-m-d h:i:s', $timestamp ),
	'post_date_gmt' => date( 'Y-m-d h:i:s', $timestamp - $gmt_offset ),
	'edit_date'     => true,
);

return wp_update_post( $updated_post );

Why does this turn off the setting? I suppose I can run the wp_update_posts() and, after that, set the send2tg custom field back to yes, but I’d also like to understand why this disables the setting. It shouldn’t, so maybe there’s a bug in the plugin?