WeirdPlop

This is flagged for the wrong version, and Mojira specifically stipulates to only make posts in English!

Likely Working As Intended, especially for Ender Pearls. Making the sound run where you teleported from would make you not hear it, since you would be.. somewhere else by the time it’s playing.
I can also see why they did it for Endermen, as it makes you able to find them easier.

Your game was quite laggy in that clip. Perhaps it has to do with that?

Can confirm.

The behavior you’re seeing with the Nether is intentional. If you didn’t know, every 1 block in the Nether is worth 8 in the Overworld or End. Seems like using the “in” argument of “/execute” does the math for you, so instead of running “/execute in the_nether run tp ~ ~ ~", run “/execute in the_nether positioned ~ ~ ~ run tp ~ ~ ~" to avoid the dilation.

Can confirm the issue you’re seeing with the End in the latest snapshot, though. Odd that it doesn’t apply to 1.21.8.
It also seems like the first teleport you make to the end works fine, but any after that don’t? Not sure.

The grass and dirt blocks are built into the structure files. The developers could replace the dirt and grass blocks with structure blocks? But this works fine. The only case you would even notice this is in alternative map generation, as you said. I would personally classify this as Working As Intended.

“Fixing” this would require making a lot of new code just for a small edgecase. The reason it’s visible is because you can see a small amount of the block from the top, and the only alternative is completely getting rid of that rendering, which would look weird. This same thing applies to slabs.
TLDR: Would take too much code, and this is the most efficient thing the developers could’ve done. Working as intended.

“Recipe Book” would be more accurate, as “Knowledge Book” also exists as a command-only item.

you can. just press whatever key you have for “Swap Item With Off Hand” while hovering over the slot you want to put it into.
even if you couldn’t do that, this isn’t a bug, as it’s not a flaw with the code, that would be a flaw with the menu design.