This is based on a bug-report on tex.sx: http://tex.stackexchange.com/q/333987/323

If a document starts with a typing environment then line numbering is not shown. Consider



  Line 1
  Line 2
  Line 3
  Line 4


If this code is run without enabling the bugfix mode, only the first line is numbered.

If the typing environment is not first block (e.g., if you enable the bugfix mode), then the line numering is correct.

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