Overwriting metrics on auto attach glyph not working

i have installed the update and indeed run into another issue: the ኀ glyph is an auto attach with ነ and an unmapped mark attached to the left. ኀ’s metrics itself are fine, and it uses ነ’s anchors which is what i want, but when i want to make a glyph with an autoattach from ኀ, it messes up, as seen in the images. it appears to use the anchors with the exact position as ነ, when i want it to use the ones from ኀ which are the same but offset by the autoattach and overwritten metrics