When grouping boxes into baseline-sharing groups for content-alignment, one of the checks we do is that the elements either have "stretch" or "start"/"end" self-alignment. This ensures that the contents all share an edge in the direction they want to align towards, preventing silly situations.

However, if an element is last-baseline-aligned, and is set to "stretch", but with a max-height smaller than the container's height, it won't line up with an "end" element (because, when "stretch" is constrained, it falls back to "start"). This makes them not compatible. We should handle this in the algorithm.