Large forms (some OJL Guides) cannot be saved due to exceeding PHP max input variables

To replicate, try to save changes to Industrial Equipment OJL Guide (deta-18825-15-e) 2-Year in Demo WBL. The following error occurs:

Warning: parse_str(): Input variables exceeded 20000. To increase the limit change max_input_vars in php.ini. in /workspace/api.php on line 44

Warning: parse_str(): Input variables exceeded 20000. To increase the limit change max_input_vars in php.ini. in /workspace/Framework/Router/ControllerCaller.php on line 73

Fatal error: Uncaught Error: Call to undefined method API\V2\Fields::render_json() in /workspace/API/V2/Fields.php:122 Stack trace: #0 /workspace/Framework/Router/API/Route.php(52): API\V2\Fields->update(Array) #1 /workspace/Framework/Router/ControllerCaller.php(75): Framework\Router\API\Route->perform() #2 /workspace/index.php(81): Framework\Router\ControllerCaller::call_global() #3 {main} thrown in /workspace/API/V2/Fields.php on line 122