Properly Connects, Fails to Download (Various Errors, Log Attached)

[LegendOfCatBro]

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Describe the bug Everything works fine, client is able to connect to localhost and fully play the game but the downloader fails to actually download. Program does produce an output, outputted world is completely empty and appears to be overwritten with randomly generated chunks.

Error Log From what I can read:

• ArrayIndexOutOfBoundsException
• varInt is too big
• Getting access denied error from trying to write to C:\Windows\System32\world instead of the defined C:\Users\torra\Downloads\world
• Invalid VarInt found! Packet structure may have changed. log.txt (Copied and pasted into a new text document)

Version

• Game: Minecraft 1.20,2, Fabric Client, can post mod list if needed.
• Server: 1.20.2 Paper server, known plugins are Gyser and Coreprotect. Has some "anticheat plugins" according to the admin.
• Downloader: latest Downloader is running in C:\Users\torra\Downloads\

[GabiRP]

Tried on 1.20.1 and it's working fine. Something probably changed on 1.20.2

[secretbetta]

Looks like 1.20.2 changed how packets are sent: https://minecraft.fandom.com/wiki/Java_Edition_1.20.2/Development_versions

[febrance]

Looks like 1.20.2 changed how packets are sent: https://minecraft.fandom.com/wiki/Java_Edition_1.20.2/Development_versions

dont use fandom, just as a suggestion. it saves you a ton of headache, the new wiki is at https://minecraft.wiki