When using the UI to "clear all caches" the zend opcode cache should be cleared also.
I use git pull to deploy to production. Unfortunately sometimes, some dependencies run into error conditions. Reason is, that my opcache.revalidate_freq is 60 seconds.
I suggest to do an opcache_reset() in the "clear all caches" procedure to have that cache cleared, too.
I suggest to do an opcache_reset() ind drush cr, also. (But I never had that sync bug with drush)
I use Drupal 8.7 on CentOs 7.6 with
[proxiss@marge ~]$ php -v
PHP 7.2.20 (cli) (built: Jul 2 2019 13:37:16) ( NTS )
Copyright (c) 1997-2018 The PHP Group
Zend Engine v3.2.0, Copyright (c) 1998-2018 Zend Technologies
with Zend OPcache v7.2.20, Copyright (c) 1999-2018, by Zend Technologies
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
I think you could just add it to the /core/rebuild.php file, and do a curl call to that instead.
So, modify rebuild.php like so:
// Clear user cache for all major platforms.
$user_caches = [
'apcu_clear_cache',
'wincache_ucache_clear',
];
Should become:
// Clear user cache for all major platforms.
$user_caches = [
'apcu_clear_cache',
'wincache_ucache_clear',
'opcache_reset',
'apcu_clear_cache',
];
Then drush cr can do a call to /rebuild.php.