From the datasheet for the TS971... The absolute maximum differential input voltage is ±1V.
How concerned must I be with that if I am buffering a square wave whose amplitude exceeds 1V? In the buffer configuration, of course, the output is connected to the inverting input, so any change in the non-inverting input will be followed by the exact same change in the inverting input. Does this absolute maximum specification care about short term transients like that or is it just worrying about the case where someone might (for example) try to use the amp as a comparator with a very wide delta?