I still unable to duplicate/unable to save skin

Please attach %APP_DATA%/.minecraft/launcher_log.txt for us to get more info about your problem.

[Info: 2020-09-03 13:44:04.3275248: NetQueue.cpp(232)] NetQueue: Setting up.
[Info: 2020-09-03 13:44:04.3276417: mainWindows.cpp(81)] Running launcher bootstrap (version 771)
[Info: 2020-09-03 13:44:04.4313813: NetQueue.cpp(232)] NetQueue: Setting up.
[Info: 2020-09-03 13:44:04.4650653: Common.cpp(32)] Native Launcher Version: 771
[Info: 2020-09-03 13:44:04.4653327: Common.cpp(33)] Operating System: Windows 10 Home China
[Info: 2020-09-03 13:44:04.4659137: Common.cpp(34)] Application Data directory: ...\.minecraft
[Info: 2020-09-03 13:44:04.4659648: Common.cpp(35)] Executable Path: /.../MinecraftLauncher.exe
[Info: 2020-09-03 13:44:04.4660050: Common.cpp(36)] App Directory dir: ...\Minecraft Launcher
[Info: 2020-09-03 13:44:04.4660446: Common.cpp(37)] Game data directory: ...\.minecraft
[Info: 2020-09-03 13:44:04.4660847: Common.cpp(38)] Launcher dir: ...\Minecraft Launcher\game
[Info: 2020-09-03 13:44:04.4661351: Common.cpp(39)] Java dir: ...\Minecraft Launcher\runtime\jre-x64
[Info: 2020-09-03 13:44:04.4661749: Common.cpp(40)] TmpDir dir: ...\MinecraftLauncher
[Info: 2020-09-03 13:44:04.4662478: Common.cpp(41)] x64: true
[Info: 2020-09-03 13:44:04.4664583: main.cpp(205)] Uninstalling minecraft launcher
[Info: 2020-09-03 13:44:04.6106200: NetQueue.cpp(239)] NetQueue: Initiating shutdown.

This report appears to be a duplicate of MCL-15978. If you have any additional information to provide regarding this issue, feel free to comment on the parent ticket. If you feel that this issue is affecting you, feel free to vote for the duplicated ticket, to give Mojang a basic idea of how many people are impacted by the problem. Just to further inform you, this will not determine how quickly the bug gets handled or fixed.

Forward duplicating to MCL-15978 as that seems more active