Font Family dropdown missing on Paragraph and Heading

I’m working on a child theme with theme.json customizations. I’m not sure why some font settings work for some blocks and not for others. For instance, the code below works wonderfully. I insert a button, and I can choose which font I want to use:

"core/button": {
  "typography": {
    "fontFamilies": [
      {
        "fontFamily": "Asap, sans-serif",
        "name": "Asap",
        "slug": "asap"
      },
      {
        "fontFamily": "\"Museo Sans\", sans-serif",
        "name": "Museo Sans",
        "slug": "museo-sans"
      }
    ]
  }
},

However, it doesn’t show on paragraphs or headings, where I really need it to be:

"core/paragraph": {
  "typography": {
    "fontFamilies": [
      {
        "fontFamily": "Asap, sans-serif",
        "name": "Asap",
        "slug": "asap"
      },
      {
        "fontFamily": "\"Museo Sans\", sans-serif",
        "name": "Museo Sans",
        "slug": "museo-sans"
      }
    ]
  }
},
"core/heading": {
  "typography": {
    "fontFamilies": [
      {
        "fontFamily": "Asap, sans-serif",
        "name": "Asap",
        "slug": "asap"
      },
      {
        "fontFamily": "\"Museo Sans\", sans-serif",
        "name": "Museo Sans",
        "slug": "museo-sans"
      }
    ]
  }
},