I believe in the OP, I indicated one or the other is in Big Trouble. (Please reread the OP.).
There is plenty of information written about it. I would start by looking at some of the footnotes in commentaries to lead to reliable resources to read about it. A Google search will yield good resources but you have to be patient and sift through a lot of ignorance to find scholarly papers. Be more verbose in the search terms.
Almost all the English translations include it in vs 8 but not in vs 11. The brief time I have had to read about it tells me that the answer will be that it is not missing because it was never there, but it will take me more than a day to be able to absorb the information that is written about this.
I would say that no one is in trouble because neither one would be what the verse taking and adding was talking about. They are doing their best to translate. It is not a conspiracy.
