I also have the problem with the missing suggestions. They just disappeared someday. But still work when I used the fast edit.
So the suggestions can work with this device, this chrome version and this keyboard.
But it is not only a discorse issue. If I change the keyboard app and use another one the suggestions work everywhere.
I did some research when the suggestions disappeared. I think there was a change in chrome to integrate suggestions (those that e.g. the google search shows, while you type) into the keyboard suggestions. But that only works with new keyboard apps.
So the keyboard app is an issue, but since it still works in the fast edit window there could be something discourse could do to make it work.
Editing the post with my usual keyboard app
Using fast edit and my usual keyboard app
Editing with a different keyboard app
