Describe the bug
On Android only, when tapping enter at the end of a quote or pullquote block citation to split the block, the block is split, but a new empty line is also added to the citation. No new line should be added.

To Reproduce
Steps to reproduce the behavior:

1. Add a Quote block
2. Add some text to the citation
3. Tap Enter
4. Observe that a new paragraph block has been created
5. Observe that the quote block's citation now has a second line (i.e., there is a <br> in the html).

Expected behavior
Tapping Enter within a citation should split the block without adding a new line to the citation.

Screenshots

Smartphone (please complete the following information):

• Device: Pixel 1
• OS: Android X
• Version 15.2.1