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Try with Java 17. I had the game crash with Java 21 previously, and that without any other mods apart from Distant Horizons, Iris and their companion mods.
Exactly. I removed all mods except those considered essential (DH, Iris...) and the game started correctly. I will check each mod one by one to find the problem.
Thanks for your help!
(FOR FUTURE READERS OF THIS THREAD): what was causing the exit code 1 for me was "effective 1.3" mod, which is unfortunately only compatible with Fabric for 1.19.2 and below. You still can play with it if you use Quilt.