Confirmed for 16w44a (see screenshot).
Up?
An example with seed and coordinates. (see screenshot)
Better global view on this one. As you can see, the bridge does not match with the small room.
Your solution seems very clear and easy to deploy. The jukebox issue is another problem, less important than this one (for me).
Confirmed for 1.8.5 and 1.8.6
I can confirm this bug. I am running Ubuntu 20.04.2 (Gnome as well) and randomly about half of the time I press "t" to open chat, not only does it open the chat context but also types a "t" in it. There doesn't appear to be any other problems, in particular I am not getting duplicate letters when I type stuff. I am using the latest Minecraft version, namely 1.18.1 (unmodded, official launcher).
Edit: confirmed for Ubuntu 21.10 as well.
Edit²: confirmed for Ubuntu 22.04.