I have recently migrated a site from 5.6.3.5 to 5.80. All seems to have gone ok, there were a few issues with having to replace problog with another package.
I have today identified an issue with the migrating of Tags. All of the tags have imported and are still associated with the correct page item, but when the migration imported the tags it created duplicate entries in the atSelectOptions table, when you try to get a tag usage count for a particular tag it is reporting 1 when there are multiples. I have done some testing by adding new tags into the site and for these the usage count is correct. I have also tried adding an existing tag into another page but that results in another entry in atSelectOptions and a count of 1 showing up multiple times. This is the code I am using to display the list and count

<ul class="tms-tag-list blog tags">

<?php
$ak = CollectionAttributeKey::getByHandle('tags');
$akc = $ak->getController();
$pp = false;

$tagCounts = array();

$ttags = $akc->getOptionUsageArray($pp);


$tags = array();
foreach($ttags as $t) {
$tagCounts[] = $t->getSelectAttributeOptionUsageCount();
$tags[] = $t;
}
shuffle($tags);

for ($i = 0; $i < $ttags->count(); $i++) {
$akct = $tags[$i];
$qs = $akc->field('atSelectOptionID') . '[]=' . $akct->getSelectAttributeOptionID();
echo '<li><a href="/ns/written-source-communications/written-source-communication-search-results/?'.$qs.'">'.$akct->getSelectAttributeOptionValue().'<span class="postCount">'.$akct->getSelectAttributeOptionUsageCount().'</span></a></li>';
}

?>
</ul>

I am open to either changing this code to correctly show the count or fixing the underlying data,

Thanks
Martyn