Article Summary loses underline & italics formatting

Steps:

1. Insert a “summary" block into the article
2. Write a custom summary 
3. Add formatting:
   1. bold
   2. italics
   3. underline
4. Click Save
5. View / Preview the article

Expected:

• If the Editor allows you to add formatting, then the published article should retain that formatting

Actual:

• Published articles:
  • retain bold formatting
  • do not retain italics
  • do not retain underline

Editor:

Article:

Note:

• I personally wouldn't use underline. If for any reason you are going to implement SOME but not ALL formatting, italics is my top priority, and then bold.