optimized dependencies are not pined

[GauthierPLM]

As part of an update, I tried to run optimize with this option but in my package.json, the dependencies still use the range "^1.x.y" in all cases. Additionally, the output ends with a warning:

$ yarn dlx socket optimize --pin
# yarn resolution ....
Updated 80 Socket.dev optimized overrides.
Added 3 Socket.dev optimized overrides 🚀
✖️ Socket Optimize: yarn/classic install failed to update yarn.lock

I am using Yarn 4.6.0, Node 23.6.0. Is there something I misunderstood?