In the evidence, the right-side component of the glyph only appears similar to "互" but is not actually "互"; it is a variant form of "氐". I have some doubts about whether it is appropriate to encode this glyph directly as "互". The data shown below for "低" in HNG could serve as a reference.
https://search.hng-data.org/search/%E4%BD%8E

互 is a widespread variant glyph of 氐, so does 玄/至/丘……

互 is a variant of 氐.
The right part of this glyph is "互". 《干祿字書．平聲》:「互、氐，上通下正，諸從氐者，並準此。」