Table headers change their color to Whisper Grey

Issue Summary

When setting up a table with a header colored as in the old editor, after publishing the page it will change to a different shade of grey.

Steps to Reproduce

1. Create a page using the legacy editor template;
2. Add a table with two rows, at least;
3. Insert some text and in the table header row, set its color any color but (#EAEAEA):
   
4. Publish the page.

Expected Results

The table is shown according to what we set

Actual Results

The header gets its color changed to Whisper grey (#EAEAEA).

Workaround

If your page is eligible, you can convert it to the new editing experience, or even use the new editor to create your page there. Another possibility is to use a different color on your table header.