Highlight does not work when entering hex values to set background or text color

[hagege]

Description

When I try to set the highlight in a paragraph via the toolbar, at least the input of a hex code to change the background or text color does not work. The input is "disturbed" and I cannot enter numbers and digits as desired. The input of RGB works. @ndiego also checked the issue in the Slack channel #outreach: "Something a bit funny is going on."

Step-by-step reproduction instructions

1. Create a paragraph
2. Mark a textpart (for example a word)
3. via toolbar selection highlight

Screenshots, screen recording, code snippet

Environment info

=== Environment

• WordPress: 6.5-RC1-57778
• PHP: 8.2.15
• Server: Apache/2.4.58 (Win64) OpenSSL/3.0.12 PHP/8.2.15
• Database: mysqli (Server: 5.7.33 / Client: mysqlnd 8.2.15)
• Browser: Chrome 122.0.0.0 (Windows 10/11)
• Theme: Twenty Twenty-Four 1.0
• MU-Plugins: None activated
• Plugins:
  • WordPress Beta Tester 3.5.5

Please confirm that you have searched existing issues in the repo.

Yes

Please confirm that you have tested with all plugins deactivated except Gutenberg.

Yes

[webmandesign]

I can confirm this is the case. It seems the Highlight custom color control only allows short 3-characters-long hex color setup. Trying to insert long hex color format (6 chars) does not work and the color control resets itself while typing in the color.