When using 1.19.4, the game will use the wrong texture for the Dark Oak Boat, it will use the upcoming Cherry Boat texture.
The server is running on Paper 1.19.3, I'd presume the 1.20 experimental data pack wouldn't work, nor would there be a reason to even test it out on our main server. (In other words it doesn't have it), I don't believe the plugins are the issue either.
Thought this was originally a problem with my fabric installation, which is in a different folder in contrast to vanilla, reproduced it on vanilla as well, my friend in the server also has the same result on his installation (he uses fabric for the record). This does not happen in single player, only multi.
Here's a video https://youtu.be/dHeydgU2qvw (the video was too large to upload so I had to do it on youtube.)
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Invalid, modded server.