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The Dropbear SSH server from the Void Linux repo's is version 2024-85.
This .xbps package contains the SSH server dropbear-2025.87 compiled in KLV-Airedale-sr17 is from March 2025.
Tested in KLV-Airedale, KLV-Spectr and Puppy Linux Noblepup64
UPDATED Fixed X11 Forwarding and package uploaded on 13 Mar 2025 21:44
dropbear-2025.87_3.x86_64.xbps There seems to be problems with X11 forwarding!! 
I am testing further to find the cause. Version 2019.78 is working though just as it should so for now keep or revert to dropbear-2019.78
Good news, after a recompile and re-packaging the Dropbear SSH server is forwarding X11 
Latest version is attached to the first post.