To reproduce this bug, just click on the customize button.
Environment
OS: Windows 10 (ver 10.0, arch amd64)
Java: 1.8.0_121 (by Oracle Corporation)
Launcher: Minecraft Launcher 1.6.73-j (bootstrap 5)
Minecraft: 17w15a (updated Wed Apr 12 11:31:47 CEST 2017)
Linked issues
duplicates 1
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