[telendram]

The probability is much lower than that.

To begin with, it requires the distance between 2 consecutive matches to be exactly 65536. This is extremely rare. Mountains of files never generate such a situation. Then it needs to employ a repcode match as the match following the 65536 literals. Repcode matches are more common after short literal lengths (1-3 bytes). Needless to say, 65536 is far from this territory, so it's uncommon to say the least. Finally, the block splitter must be active (hence only high compression modes), and it must decide to split the block exactly at the boundary between the literals and the repcode match.

So this is not 0, since Google found a sample, but all these conditions _together_ have an astronomically low chance to happen, as in competitive with winning the Powerball jackpot. I wouldn't worry so much for my own dozens of archives.