Boolean yml parameters are interpreted incorrectly during render_website()

[joelnitta]

I have

execute:
  freeze: true

In my _quarto.yml, and it renders fine (with freeze working properly) when I run quarto render at the command line.

But when I try to do render_website(), I get

Error: Project _quarto.yml validation failed.

(line 34, columns 11--14) Field "freeze" has value yes, which must instead be `true` or `false`