It looks like some plugins are throwing an error when installing. I was trying to install WooCommerce but it looks like it errors before installing.

Example URL:
https://playground.wordpress.net/?plugin=woocommerce

Also, I noticed that if you manually install WooCommerce from the dashboard (Plugins > Add New) after a short while the site crashes or just freezes and looks like it goes offline. I'm not able to get passed the WooCommerce Guided Tour. I'm not sure if the two issues are related or not.