In the oldest Syriac texts ܒܹܝܬ‏ is used for both "between" and "among" while with pronominal suffixes its form is ܒܲܝ̈ܢܲܝ‏. Somewhat later many classic texts distinguish between this form as "between" while its plural form ܒܲܝ̈ܢܵܬ‏ is used for "among".

See also s.v. byn, byny, bynt. Also see note s.v. bynt for LJLA.
The Mandaic usage bit, bit with d and before a verb is dubious. perhaps rather b_ p + d_ c !? But the form binat with pronominal suffixes is well attested.
It is often difficult to distinguish between this usage and the homophonous construct of "house" in Syriac; hence the origin of the usage as a variant of byn and bynt.
In the sole LJLA example, here cited, the first spelling is an error for the Syriac ܒܪܝܫ ܓܙܪܐ.. The second represents a typical example of the ambiguity in Syriac between "place of" and "among". Surely, though, the LJLA author understood the former.
The sole CPA example, as cited, is a Syriacism.