[Java] Fill data gaps from vanilla sources: 26.2, 1.13.1 palettes, 1.14.2, windows, commands, 1.9.1 - #1287

[Java] Fill data gaps from vanilla sources: 26.2, 1.13.1 palettes, 1.14.2, windows, commands, 1.9.1#1287

milutinke wants to merge 2 commits into

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