This release addresses the following two issues:

• #31438 restores the make-container-max-widths mixin. We won't be using the mixin ourselves, but it will remain in the codebase for the rest of v4 with today's release. We've added a deprecation notice as well.
• #31439 removes flex: 1 0 100% from .rows. This was added to address shrinking rows inside the navbar component after our responsive containers were added in v4.4.0. Removing this rolls us back to the expected grid and flex behavior—your row will shrink unfortunately without further changes. We could add extra custom CSS to address this, but it seems shortsighted to rush into that. Instead, apply .flex-fill to the .row and your row will behave as usual.