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.