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

https://github.com/ericonr/void-packages thunder
https://github.com/void-linux/void-packages/pull/23789

thunderbird: add thunderbird-wayland wrapper.
It's similar to the one shipped by Firefox.

A patch file from https://github.com/void-linux/void-packages/pull/23789.patch is attached