When I put on the boots enchanted with Soul Speed and walk on Soul Sand, the game crashes and I can't get back into the world.
java.lang.IllegalArgumentException: Modifier is already applied on this attribute!
And then I found a bug fix video for this modpack.
I opened the additional-additions-config.json file in the config folder.
and change the "EnchantmentSpeed" : true to the "EnchantmentSpeed" : false
Luckly,I can enter my world angain!

crash-2025-03-15_19.40.21-server.txt

latest.log

and the vedio url:
【乌托邦之旅bug修复合集又来咯-哔哩哔哩】
The process of fixing this bug is located between 10:13 and 12:39 in the video.