When selecting "Open to LAN" from the game menu, the game only listens over IPv4. On pure-IPv6 hosts, this means that minecraft basically only listens for localhost.
Listening to ipv6 be default should be desirable, since most OSs will actually also listen on ipv4 if you listen to ipv6, meaning you get to keep backwards compatibility at no cost (and you don't actually have to open two sockets, etc).
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I had read that issue you've linked and this is not a duplicate of it: "This appears to be a problem with the Minecraft.exe launcher, rather than the minecraft.jar file itself.".
This issue is on GNU/Linux, as described above, Minecraft.exe is completely unrelated.
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Minecraft.exe is the launcher, which launches minecraft.jar
Correction, Minecraft.exe is the bootstrap, which updates the launcher, which updates the jar.
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Correction, Minecraft.exe is the bootstrap, which updates the launcher, which updates the jar.
I honestly do not know of the inner workings of Minecraft.exe, nor do I have any access to any wintel systems to try and understand how it works.
But the first sentence on the linked issue says it's an issue on minecraft.exe and not minecraft.jar. It that's mistaken, could you please update it? As-is, it clearly states that it's not this issue.
This issue has been reported already. It has been linked to the original bugreport.
Please search before reporting any bugs, as it's likely that one exists already.