Bold and italic text does not work properly on Android

##### Details

* Trix version: 1.3.1 (from Yarn)
* Browser name and version: Chrome and Firefox, see below
* Operating system: Android 10

The bold and italic functions do not work correctly on Android. Chrome and Firefox have different issues.

On Chrome (89.0.4389.86), pressing bold/italic depresses the action button. Correct so far, but when writing text it is not bold/italic. It will only turn bold/italic after pressing space, or rather, it will keep the previous style until space is pressed. I'm attaching a video of the bug.

https://user-images.githubusercontent.com/12595797/111477382-b8e68c00-8737-11eb-95e3-a311ca64b677.mp4

On Firefox (86.1.1), the bold/italic indicators do not work correctly. Pressing the button depresses it, but after writing, it ends up toggling between unpressed/depressed. Unlike on Chrome, the text itself will be correctly bold or italic. I'm attaching a video of this as well.

https://user-images.githubusercontent.com/12595797/111476496-e2eb7e80-8736-11eb-8b5c-03fd5a20f506.mp4

I don't see this issue on the desktop version of either browser.