Extremely buggy when I have to use the back button on the mobile device. Typing forward it is okay but any time I have to edit its excruciating. Just started happening today.
I saw this start at the same time. It happens on my phone when I'm in the true view mode, not when I can see the text/code.
For example, if the options above your post while typing are all grayed out such as the Bold, Italic, etc and only the setting icon is available/orange then you won't get the backspace issue. If you're in the other display option for your post, toggle the setting icon so it's not orange and all the other format options become active then you will get the backspace issue.