IPv6 Crash

[KostromDan]

Recently, there have been tons of crashes caused by GML crashing while downloading something due to IPv6 issues. I've already seen more than 100 reports.

latest.log | crash-2025-07-05_18.49.35-client.txt | modlist.txt

Users are fixing it by launching the game once with -Djava.net.preferIPv4Stack=true or by disabling IPv6 entirely on their PC.

[KostromDan]

Reproduction:

1. remove if exists mod_data folder
2. add JVM arg to the game: -Djava.net.preferIPv6Addresses=true
3. launch the game, crashed.

Can reproduce on 1.19.2 - 1.20.1

[wunanc]

+1