There is a new pull request by fosslinux against master on the void-packages repository

https://github.com/fosslinux/void-packages freeplane-1.8.8
https://github.com/void-linux/void-packages/pull/25730

freeplane: update to 1.8.8, remove noarch.
fixes ftbts.

A patch file from https://github.com/void-linux/void-packages/pull/25730.patch is attached