Formatting column making the column text to disappear

Hello, I was testing Column Formatting using JSON on Name column in a document library. However, each time anything is adding, it makes the content in the column to disappear. I was trying the ...

Document Library

SharePoint Online

Gregory Melson

Apr 01, 2018

This should fix it

{
  "$schema": "http://columnformatting.sharepointpnp.com/columnFormattingSchema.json",
  "elmType": "div",
  "txtContent": {
    "operator": "+",
    "operands": [
      "[$FileName]",
      ".",
      "[$File_x0020_Type]"
    ]
  },
  "style": {
    "color": "orange"
  }
}

https://github.com/SharePoint/sp-dev-docs/issues/1524 link helped me

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Formatting column making the column text to disappear

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