Background Color + Font Color Incompatible

Steps to follow to reproduce:

• Create a new page and go to edit mode
• Write some text
• Select the whole text and change the background color (e.g. orange)
• Select part of the text and change the font color (e.g. blue)
• Click Preview/Save.

Result: The blue text no longer has an orange background.

Note: In Chrome & Safari the issue also appears when you change the font color for the whole text.

See attached images.