I have the same issue on multiple sites after the last update.
.menu .menu-full-width .nav-sublist-dropdown ul > li li {
width: 100%;
}
This targeted menu is not staying inside the div, but displaying overlapping other columns.
Here’ s a screen shot of the issue:
https://drive.google.com/file/d/1H-JoEGw92_9T8maVyGDhp8FtNs0HLPFf/view?usp=sharing