Issue : Categories are not showing in Admin Product Edit Page Magento 2.1.5

[i95Dev_Vamsi]

Hi,

In admin product edit page not showing Categories select options.

When clear all Caches, Categories are showing in product edit page.

I have debuged catalog core module,

$categoryTree = $this->getCacheManager()->load(self::CATEGORY_TREE_ID . '_' . $filter);
if ($categoryTree) {
return unserialize($categoryTree);
}

When I have remove above code in /vendor/magento/module-catalog/Ui/DataProvider/Product/Form/Modifier/Categories.php Categories are displaying as excpected.

Please share the details, how to fix these issue without core catalog module changes.

Regards,
Vamsi.

[pankajpragma]

Did you get any solution for above issue? 

[Nishu Jindal]

Hi ,

In my website, i was also facing same issue and after cache flush/redis flush, problem resolves for some time. But after content deploy issue occurred again.

After lot of debugging i found some below queries which i fired directly on the database

ALTER TABLE flag MODIFY flag_data LONGTEXT;

UPDATE flag SET flag_data = '{"system":"","scopes":"","themes":""}' WHERE flag_code = 'config_hash';

UPDATE flag SET flag_data = '{}' WHERE flag_code = 'system_config_snapshot';

And I tried to reproduce this issue again but not able to reproduce able.  can you also try this solution it may solve your problem as well.