[gatsby-image] alt property is not shown

Description

There is no observation problem. Just the SEO checker find out that the alt property is missing.

Steps to reproduce

gatsby new gatsby-site
cd gatsby-site
gatsby develop

Then go to the src\components\image.js and replace the line from return <Img fluid={data.placeholderImage.childImageSharp.fluid} /> with return <Img fluid={data.placeholderImage.childImageSharp.fluid} alt="test" />

Expected result

Open the test page on browser and inspect the astronaut. I would expect the image would have the alt="test" property and with the word test.

Actual result

Instead it shows alt="" on the outmost image div.

Environment

  System:
    OS: Windows 10 10.0.19041
    CPU: (8) x64 Intel(R) Core(TM) i7-7700HQ CPU @ 2.80GHz
  Binaries:
    Node: 12.14.0 - C:\Program Files\nodejs\node.EXE
    npm: 6.13.4 - C:\Program Files\nodejs\npm.CMD
  Languages:
    Python: 3.7.6
  Browsers:
    Edge: 44.19041.1.0
  npmPackages:
    gatsby: ^2.18.22 => 2.18.22
    gatsby-image: ^2.2.38 => 2.2.38
    gatsby-plugin-manifest: ^2.2.37 => 2.2.37
    gatsby-plugin-offline: ^3.0.31 => 3.0.31
    gatsby-plugin-react-helmet: ^3.1.21 => 3.1.21
    gatsby-plugin-sharp: ^2.3.13 => 2.3.13
    gatsby-source-filesystem: ^2.1.46 => 2.1.46
    gatsby-transformer-sharp: ^2.3.12 => 2.3.12

[winstonma]

Sorry I published after running gatsby develop. I ran gatsby build and updated the repo again. Thanks for your time.

After the build it seems it is okay. But I saw the problem in gatsby develop. Not sure if they have any relationship.

[winstonma]

Thanks for your time.