Warning: call_user_func() expects parameter 1 to be a valid callback, cannot access protected method

[rhelms]

I've recently updated a project from PHP 7.0 to PHP 7.2 that uses antecent/patchwork to allow me to mock particular functions. Under PHP 7.0, this was working well, but under PHP 7.2 I get the following warnings.

PHP Warning: call_user_func() expects parameter 1 to be a valid callback, cannot access protected method PhpAmqpLib\Channel\AMQPChannel::channel_close_ok() in /var/www/api/vendor/antecedent/patchwork/src/CallRerouting.php(447) : eval()'d code on line 20

PHP Warning: call_user_func() expects parameter 1 to be a valid callback, cannot access protected method PhpAmqpLib\Connection\AMQPConnection::connection_close_ok() in /var/www/api/vendor/antecedent/patchwork/src/CallRerouting.php(447) : eval()'d code on line 20

When updating from 7.0 to 7.2, the php-amqplib/php-amqplib dependency was updated from v2.8.1 to v2.9.2. As far as I can tell the channel_close_ok and connection_close_ok functions mentioned have always been protected functions, and both functions are defined on classes that extend abstract classes.

The project is using patchwork 2.1.8.

The initial issue is that I can't tell how the eval is getting invoked for these functions in the first place. The eval location at line 447 at CallRerouting.php is a part of createStubsForInternals. The $name used in the eval should be coming from Config\getRedefinableInternals() which is the list of default internals (from Config.php) and any items in the patchwork.json, in the redefinable-internals section, for which I have syslog and sleep.

Unless the issue is that it's call_user_func that has been redefined by the in the rerouting, and the phpamqplib code base is using call_user_func to run the protected functions, and it can't because the it isn't being run from the same namespace as the protected functions.

Have I hit a limitation in patchwork with regards to how call_user_func may get used to call protected functions in third party libraries?