Steps to reproduce:

1. In VE standalone, edit <h1>x</h1><h1>y</h1>
2. Turn on input debugging and put the cursor after 'x'
3. Press CTRL+U (creating a unicorned underline span)
4. Press right arrow then press left arrow.

Expected behaviour:

• Right arrow moves the cursor to the the next paragraph and the unicorns disappear.
• Then left arrow moves the cursor back to just after 'x'

Observed behaviour:

• Right arrow does move the cursor to the next paragraph, but the unicorns remain
• Then left arrow does not move the cursor