When plotting errorbar limits, the arrow head points in the wrong direction when the x (y) axis does not increase to the right (up) on v2.0.0.
plt.subplot(121)
plt.errorbar(0.5,0.5, xerr=0.1, yerr=0.1, uplims=True, xlolims=True, marker="o")
plt.xlim(0,1)
plt.ylim(0,1)
plt.subplot(122)
plt.errorbar(0.5,0.5, xerr=0.1, yerr=0.1, uplims=True, xlolims=True, marker="o")
plt.xlim(1,0)
plt.ylim(1,0)
plt.show()