teasers not formatted

I am having a similar problem and no luck fixing it.

I figured out a patch that fixes this. Replace the following:

function bookreview_validate(&$node) {
if (variable_get('teaser_length', 600)) {
if ($node->synopsis) {
$node->teaser = node_teaser($node->synopsis);
}
else {
$node->teaser = node_teaser($node->review);
}
}
else {
// teasers are disabled, display whole book review
$node->teaser = $node->body;
}

with:

function bookreview_validate(&$node) {
if (variable_get('teaser_length', 600)) {
if ($node->synopsis) {
$node->teaser = check_output(node_teaser($node->synopsis), $node->format);

}
else {
$node->teaser = check_output(node_teaser($node->review), $node->format);
}
}
else {
// teasers are disabled, display whole book review
$node->teaser = check_output(node_teaser($node->synopsis), $node->format);
}

Applied to 4.7 release.