5.1 Pre-Release 2

The second pre-release is out with some minor tweaks and bug fixes. Enjoy!
For servers; the server.properties file for this version.

Changelog

Revised some item categories and added minor new items
Updated Credits
During the skybox phase, all entities are now invulnerable and items cannot be picked up
Fireworks properly spread and explode again

Added Tuff as an alternative to deepslate items
Added big dripleaf as an alternative to other lush cave items
Added dried kelp
Stonecutter and dried kelp block are now no longer mutually exclusive
Stonecutter is now mutually exclusive with other "basic iron" items (Acacia Hanging Sign, Raw Iron Block, Iron Block, Cauldron)
Added new kelp category with dried kelp and dried kelp block
Piston and sticky piston are no longer mutually exclusive with redstone block and repeater
Renamed "Common Burried Treasure Loot" to "Shipwreck Loot"
Blue trimmed leather boots now have a custom tooltip in the category chests saying "Any Armor Trim" instead of "Shaper Armor Trim"
Bugfixes

Fixed game info missing that granite can still generate in copper ore veins
Fixed page missing in pregen book
Fixed lockout mode claiming victory early in certain edge cases when multiple teams have the same amount of items
Fixed Deepslate category missing a translation (#201)
Fixed entities right at the spawn block suffocating at the game start (#202)
Fixed items being possible to be picked up before the game starts (and then being cleared) (#203)
Fixed reloading the world while in the skybox making you unable to use the "Leave Game" sign
Fixed Fireworks no longer having an explosion effect (#187)
Fixed Fireworks no longer being spread around the player (#188)
Fixed capitalization of "Blue Trimmed Leather Boots"