Very frequently, pets won't teleport to the player when the player moves far enough away, or even follow at all.

I̶ ̶b̶e̶l̶i̶e̶v̶e̶ ̶t̶h̶i̶s̶ ̶m̶a̶y̶ ̶b̶e̶ ̶r̶e̶l̶a̶t̶e̶d̶ ̶t̶o̶ ̶t̶h̶e̶ ̶w̶a̶y̶ ̶t̶h̶a̶t̶ ̶c̶h̶u̶n̶k̶s̶ ̶d̶i̶r̶e̶c̶t̶l̶y̶ ̶b̶e̶h̶i̶n̶d̶ ̶t̶h̶e̶ ̶p̶l̶a̶y̶e̶r̶ ̶a̶r̶e̶ ̶u̶n̶r̶e̶n̶d̶e̶r̶e̶d̶ ̶t̶o̶ ̶i̶n̶c̶r̶e̶a̶s̶e̶ ̶p̶e̶r̶f̶o̶r̶m̶a̶n̶c̶e̶,̶ ̶
a̶s̶ ̶o̶f̶ ̶1̶4̶w̶3̶0̶.̶ ̶I̶n̶ ̶1̶4̶w̶3̶0̶b̶,̶ ̶i̶t̶ ̶w̶a̶s̶ ̶p̶o̶s̶s̶i̶b̶l̶e̶ ̶t̶o̶ ̶s̶e̶e̶ ̶t̶h̶e̶ ̶u̶n̶r̶e̶n̶d̶e̶r̶e̶d̶ ̶c̶h̶u̶n̶k̶s̶ ̶b̶e̶h̶i̶n̶d̶ ̶t̶h̶e̶ ̶p̶l̶a̶y̶e̶r̶ ̶b̶y̶ ̶p̶r̶e̶s̶s̶i̶n̶g̶ ̶F̶5̶.̶ ̶I̶ ̶n̶o̶t̶i̶c̶e̶d̶ ̶t̶h̶a̶t̶ ̶
w̶h̶e̶n̶ ̶m̶y̶ ̶p̶e̶t̶,̶ ̶a̶ ̶c̶a̶t̶ ̶i̶n̶ ̶t̶h̶i̶s̶ ̶i̶n̶s̶t̶a̶n̶c̶e̶,̶ ̶f̶e̶l̶l̶ ̶i̶n̶t̶o̶ ̶t̶h̶e̶ ̶u̶n̶r̶e̶n̶d̶e̶r̶e̶d̶ ̶z̶o̶n̶e̶,̶ ̶i̶t̶ ̶w̶o̶u̶l̶d̶ ̶d̶i̶s̶a̶p̶p̶e̶a̶r̶,̶ ̶a̶n̶d̶ ̶o̶f̶t̶e̶n̶ ̶s̶t̶o̶p̶ ̶f̶o̶l̶l̶o̶w̶i̶n̶g̶/̶t̶e̶l̶e̶p̶o̶r̶t̶i̶n̶g̶ ̶
t̶o̶ ̶m̶e̶ ̶e̶n̶t̶i̶r̶e̶l̶y̶.̶
Tested while moving backwards so that the chunks did not unrender and this behavior still occurred.

I first (actively) noticed it in 14w30b, and the faulty behavior seems to still exist in 14w30c.