On Android only, removing formatted text from a paragraph block can get you to a state where there is no formatting and no placeholder appearing. You have to press backspace an extra time to get the placeholder to appear.

Steps

1. Add a paragraph block with some text
2. Apply formatting to all the text
3. press the backspace key once for each character in the text
4. Observe that the paragraph block is empty, with no formatting active, and without the placeholder appearing (if you check the html at this point, you will see that it is <p></p>, and that when you return from the html view the placeholder will be showing)
5. Press backspace again
6. Observe the placeholder text appear