The current behaviour of sending the Tech News is processing the message by Language Select after the Abuse Filter. However by adding several keyword that will triggering the Abuse Filter, that would be incorrectly tagged for specific edit.
By changing the order of precedence for processing the texts that's made by Special:MassMessage will mitigate this symptom, by putting the Language Select before the Abuse Filter.
The actual text that's added in the diff.
The added_lines value being added onto the diff.