There's a closed pull request on the void-packages repository

glibc: explicitly override xbps architecture on i686/ppc/arm
https://github.com/void-linux/void-packages/pull/12036
Description: This is in order to fix xbps when running on 64-bit kernels with 32-bit userland style setups. Musl already does this in order to append the -musl suffix, so no fix there necessary.