TL;DR: Gmail theme "Orcas Island" is borked. Any others?

(Maybe I should have tried harder to squeeze "theme Orcas Island" into the title...)

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Yes, this is using HN as "Google customer support", but what other option do I have?

In Gmail's web client, I use the theme "Orcas Island" for a more pleasant experience. (Not only do I like the pictures; it also changes the background from white to a less bright gray-blue.)

Today, in that theme, "Display density: Compact" is no longer working. Whitespace galore.

I noticed some other Gmail changes, e.g. the prompt to confirm mobile phone number (for security notifications). So, maybe the same push broke this aspect of theming?

So far, I've only noticed this affecting the theme "Orcas Island". (But, I'm not going to check them all...)

Googling has revealed nothing on this.