Link Unlink blend, matrix

[Darwin Giordano]

I am trying to make a link unlink with matrix and I find a detail, is that if I play the animation forward it works perfect, instead if I play the animation backwards the object starts to have inconsistencies visually, if I generate a playblast it looks perfect.

Someone who can tell me what is happening so that forward works correctly and backward if I manipulate the timeline begins to look different.