Anki Windows 2.1.44 - previews not updating changes made to cards

Hello. I’ve posted on this subject on a separate thread, but the issue seems to be with the preview function on the card browser. I’ve changed the background on my reversed card template based on tag, as per this reddit thread, but I was unable to see the changes on Windows. “Preview” would not show them.
Synchronizing and then previewing the cards on Ankidroid showed the changes, however.
What can I do to get my preview to work properly on windows?