Input:

#import "tablex.typ": tablex

#tablex(columns: (auto, auto, auto, auto),
  [lorem_ipsum_dolor_sit_amet], [lorem], [lorem_ipsum_dolor_sit_amet_consectetur_adipisici], [lorem],
)

#lorem(20)  // Just to show the page width

Result:

Observations:

• The first and third cells are overflowing.
• There is unused (horizontal) space (enough to accomodate the contents of one of the overflowing cells and most of the other)

The second observation can be demonstrated by shortening the first cell to lorem_ipsum_dolor_sit_am; now, the table renders correctly. Note that the third cell is no longer overflowing and the first cell contains more text than in the example above:

Typst 0.9, tablex 0.0.6