Timeout error when adding attachments on multisite

The site throws a timeout error when trying to create a job with attachments.

The site is under a “multisite” configuration.

The exact lines of code that are given the issue are:
https://plugins.trac.ww.wp.xz.cn/browser/wp-job-manager/trunk/includes/forms/class-wp-job-manager-form-submit-job.php#L858
Line 858 to 862

My setup does not have a company logo setup in the form, this is why the lines of code affected.

Although the site gives a timeout error, the plugin does create a weird attachment that is not an image, it sets up the correct mime-type but displays a grey square.

When no attachments are added to the form, the job is correctly created.