Night mode doesn't work anymore

[alkaris2]

• My browser: Vivaldi - 5.3.2679.70 (Stable channel) stable (64-bit) / Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/102.0.5005.167 Safari/537.36
• My RES version: v5.22.10
• Am I in reddit beta (yes/no): no

What's the problem?

Dark Mode/Night Mode toggle button no longer seems to work. I toggle it on and dark mode doesn't enable for any subreddit page I visit. Even looked at the settings for Reddit ES and nothing I change there affects the page I'm viewing, it's just broken completely.