Formatting text as 'computer code' or 'keyboard phrase' lost after save

When using the WSYIWYG editor, if I try to format certain words as code by clicking on [Styles > Computer code] or [Styles > Keyboard phrase] then despite seeing those changes in the editor, those changes are lost once I save the page.

I noticed that even though the WSYIWYG editor shows the formatted code, when I switch to Source mode I don't see any formatting for the text I'd selected.

Repro steps:
1. Click on the Edit mode for any wiki. This brings up the WSIWYG editor.
2. Highlight any piece of text.
3. From the Styles dropdown, select Keyboard Phrase. The text you selected should look like the black/white one shown in the screenshot (herd-client-id).
4. From the Styles dropdown, select Computer Code. The text you selected should look like the red one shown in the screenshot (kindle-ingestion-pip).
5. Go to the source mode, you will find that there is no formatting around your highlighted text.
6. Click on save. You will find that your formatting has been lost.

I also noticed that the 'Marker' style option in CKEditor does not work.