In load of mod. the game crash :
crash-2022-08-01_18.08.21-client.txt

Use older version of forge

Or include Future MC's access transformers with your mod cause Forge 2848+ changed how access transformers are declared

For the change of version it will not be possible. But I would be interested to know how to include transformers. And thank you for answering me.

You can copy + paste these into an access transformer for your own mod, refresh Gradle, and then you can remove them before compiling a jar of your mod.

Ok thank you very much for this information

I believe this is a ForgeGradle issue, since FutureMC should load just fine outside of dev. The only feature of the Forge versions past 2847 is support for ForgeGradle 3+, which changes how access transformers are detected. FG3 is meant for newer versions of Minecraft and it does not detect old <1.12 access transformers, so the solution is to copy + paste them when you're using them or to not bother using the new Forge at all.