Can't save product with Opcache enabled

[buskamuza]

When saving a simple product, one of the following errors occurs:

Warning: Narrowing occurred during type inference. Please file a bug report on bugs.php.net in /private/var/www/htdocs/m2-php72/magento2ce/vendor/composer/ClassLoader.php on line 412

Warning: Invalid argument supplied for foreach() in /private/var/www/htdocs/m2-php72/magento2ce/app/code/Magento/ConfigurableProduct/Model/Product/VariationHandler.php on line 243

[cieslix]

I am closing this issue as I could not reproduce the problem as part of #distributed-cd.

There was a problem in Magento/ConfigurableProduct/Controller/Adminhtml/Product/Initialization/Helper/Plugin/Configurable.php:161 with undefined index 'newProduct', but for it should be another task, when I've fixed it I was able to save product in admin panel.

Environment:

• Magento 2.3-develop,
• Zend OPcache v7.2.3, PHP 7.2.3 ( docker php:7.2-fpm )
• php.ini settings bellow
  opcache.enable=1
  opcache.revalidate_freq=3600
  opcache.validate_timestamps=0
  opcache.max_accelerated_files=7963
  opcache.memory_consumption=192
  opcache.interned_strings_buffer=16
  opcache.fast_shutdown=1

Steps:

• Log into admin,
• Add new configurable product with variants,
• Add new simple product,