Simple Captcha not working

Hi,

After upgrading WP to 6.7.2 I found that the Really Simple Captcha was not generating an image or text file in the tmp folder. After debugging I found a load of errors in the log about a missing FTP resource, which made me think that it was now trying to use FTP to access the filesystem. I had a look through the plugin code, and also the WP_Filesystem classes and realised that $wp_filesystem was now seeming to default to FTP. I noticed in the your plugin in ‘filesystem.php’ that line 22 uses the global $wp_filesystem object. Commenting out this line now forces line 42 to instantiate a WP_Filesystem_Direct class instead (which is what we need) and it started working again.
Is this a plugin bug or a configuration issue?
Thanks for a great plugin.