At the moment there isn't much feedback to the player when an entity can't be stored. This should be a simple addition, and will be targeted for the next QOL update to the mod.
This is still a long way away and in pre-release but when it is released and the dependencies are updated, the mod will be updated to the most recent version.
There's some cleaning up I could do, particularly in the class that handles the Config options. There's also a few things I had missed in the main Item class that could be changed, such as some methods being non-static where they probably should be.
As these don't appear to be the cause of the bug (from my testing) that is happening to some people in #15 I will ship these changes with the update to MC 1.19.4.
Another mod called Project: Save the Pets! protects pets from getting damaged by explosions or powder snow and the like. But if I have it installed, Emerald Lasso fails. (Setting preventAttack: false doesn't work as I'd expect.) Do you have any suggestions?
So I was using the lasso for a bit and it worked fine, but now I have to rejoin every time I use it. I can pick up and place 1 mob no problem, but the second time I try to do it, it doesn't work, and is just considered me hitting a mob until I relog again.
There are new textures for the lasso which I should be able to use in place of the enchanted effect. One for an empty lasso and one when it is has an entity inside it.
If people want the ability to just store everything in the lasso, this currently is possible. Add an config option that allows the whitelist to be skipped if the player wants to allow all mobs.