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Two brains are better than one
Individual work seems good. It seems normal. The periodic reviews and handoffs are all part of how work is done. The knowledge silos, slow feedback loops, and increased risk of errors are all just part of the game.
Therefore...
Have two people work together on the same task in defined intervals, with frequent rotation of pairs. The pair actively collaborates—one person drives (does the actual work) while the other navigates (thinks strategically, spots issues, suggests approaches).
You can take this even further with something called mob programming (or, for non-programmers, mob working). Have a small group of three to five people, or an entire lean team (19) work together on a single task, with one person driving while others collaborate on direction, taking turns at the keyboard at regular rotations.