Hi,
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
\starttext
\doifmode{bugfix}{Whatever}
\starttyping[numbering=line]
Line 1
Line 2
Line 3
Line 4
\stoptyping
\stoptext
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.
Aditya
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