Image thumbnails broken after latest update

Edit: This appears to have been fixed already with another backend update. Leaving the post below as-is.

Current version in the footer: UI: 0.19.0-rc.11 BE: 0.19.0-rc.10

Starting today, most image thumbnails and pictrs links will not load. I tried clearing cookies and I tried in three different browser engines (Firefox, Chromium, Safari).

If I try to open one of the image URLs directly in my browser, it shows {"error":"auth_cookie_insecure"}.

Interestingly, images will load correctly if I am NOT logged in. Why are the pictrs URLs even checking cookies when they do not require auth? Is that new behavior in this version of Lemmy?

Here is an example post: https://lemmy.sdf.org/post/8482278

And an example direct image URL from that post: https://lemmy.sdf.org/pictrs/image/c8556f4f-d33c-4cac-86f3-975726ea69ec.png

I am interested to know if others are seeing the same issue. I have not exhaustively tested different cookies settings in my browsers, so it's possible some anti-tracking privacy settings are interfering with this behavior.

Worth noting is that the Eternity app on my phone continues to work. I did not even need to log out and back in today, like I did in my browsers.