Issue Summary

There are 7 colors out of 21 colors from the color palette affected that the text color is the same as the background color, which makes the text invisible unless we highlight the text.

This is reproducible on Data Center: (yes)

Steps to Reproduce

1. Install Confluence and Jira.
2. Set the application link. 
3. Create a version release from Jira. 
4. Add a Jira Issue Dates event from Confluence, select the project that you just created the new release, and show the Version Due Date. 
5. Confirm the event can be displayed from the Confluence team calendar. 
6. Release the version release from Jira. 
7. Refresh the Confluence team calendar again, 7 colors out of 21 colors become white for both text and background in the White Theme, or become black for both text and background in the Dark Theme. 

Please refer to the screen video regarding the issue reproduction:

• Calendar_color_issue_reproduction.mov

Expected Results

The text should be visible no matter the situation below:

1. The color of the event. 
2. White Theme, or Dark Theme. 

Actual Results

7 colors out of 21 colors from the color palette are affected as below:

Workaround

Currently, there is no known workaround for this behavior. A workaround will be added here when available.