Ok, that problem is solved now for new windows, but not for the one you have open right now. So here are the steps to save your game right now:
1. Open the devtools in your web browser. Do this by right clicking on anything on the web page and select ‘inspect’
2. The devtools should open, and there should be a tab called ‘console’. Open that tab.
4. Copy paste this in the console and press enter: rpgpg_wp_save_project_files(()=>{}, ()=>{})
5. The console should reply something like “Undefined”.
6. Open a new tab and load your game, check if your things were saved.