Glitchy item borders with Mipmapping and Anisotropic Filtering activated

Screenshots are self-explaining. My settings:
Mipmap level: 4
Anisotr. Filt.: 16
Texture Pack: Better than Default v1.6

After turning-off Anisotropic Filtering, the number of glitches is reduced drastically (but still visible), after turning off Mipmapping too, everything looks fine again.

EDIT:
As of 13w42a, fixed when using Mipmapping only, still happens when additionally or only using Anisotropic Filtering!