Tags: Single Apostrophe turns into &#039 in editor

[JoshuaGoode]

Describe the bug
When adding a tag with an apostrophe,', via Gutenberg -- the tag briefly disappears and the apostrophe appears as the HTML &#039.

It appears this is the only special character/symbol with this behavior.

The tag appears properly via the tag manager in WP-Admin but not in the editor.

If added via the tag manager (WP-Admin > Posts > Tags), the tag will appear properly on both the tag manager and the editor.

To reproduce
Steps to reproduce the behavior:

1. Go to a post
2. Add a tag with an apostrophe
3. Tag may disappear but will be available via tag search. The tag will show the apostrophe as &#039

Expected behavior
For the tag to properly display the apostrophe and not the HTML symbol code.

Screenshots

Video of adding a tag with an apostrophe via the editor: https://cld.wthms.co/qHOsTq

Example of what it looks like in the editor:

Example of what things look like on the tags management page:

Desktop (please complete the following information):

• OS: Latest MacOS
• Browser: Tested in latest versions of Chrome, Safari, and Firefox
• Standard US English Keyboard

Additional context

• 6.4.0 / WP Core 5.2.2

[dickmoomaw]

Reproduced this issue:
MacOS Version 10.14.6
Gutenberg Version 6.8.0
Chrome Version 78.0.3904.70
Standard US English Keyboard

[Chrispwired]

Reproduced this issue using Catalina:
MacOs Version 10.15.1
Gutenberg Version 6.8.0
Chrome Version 78.0.3904.97
Mac U.S. English keyboard

[GeoJunkie]

I worked with someone encountering this issue:
User Agent: Mozilla/5.0 (Windows NT 6.2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36 OPR/65.0.3467.48
WP 5.3

[youknowriad]

cc @jorgefilipecosta as you worked on terms escaping some time ago according to git history :)

[mdrockwell]

WordPress.com user is experiencing this issue on their site here: 2791718-zen