I hear you. Crocodile has a couple features that try to address this.
1. More comment states. Comments start as "open". The workflow I had in mind was that once the author addresses it, they would mark it as "resolved". The reviewer can go to the comments view (in the meta section on the left nav) where they can filter to resolved comments. If it looks good, they can mark it as "closed" or "open" again if they want more changes. I have this as a suggested workflow in the docs. [1]
2. The iterations section in the left nav lets you compare any two iterations. You can use this to see what has changed since your last review. Crocodile even indicates which iteration your last review was on to make this easy.
1. More comment states. Comments start as "open". The workflow I had in mind was that once the author addresses it, they would mark it as "resolved". The reviewer can go to the comments view (in the meta section on the left nav) where they can filter to resolved comments. If it looks good, they can mark it as "closed" or "open" again if they want more changes. I have this as a suggested workflow in the docs. [1]
2. The iterations section in the left nav lets you compare any two iterations. You can use this to see what has changed since your last review. Crocodile even indicates which iteration your last review was on to make this easy.
[1] https://www.crocodile.dev/docs#commenting