Working towards middle splits it can help to work on knee stability. A lack of knee stability may be one reason for not making progress when working towards the box splits.
Knee joint: anatomy, ligaments and movements
Yoga for Flexibility
How to Do the Splits: Best Stretches and Safety Tips
How to Flatten Your Middle Splits — Dani Winks Flexibility
Stabilizing the Knee Joint in Middle Splits
Stabilizing the Knee Joint in Middle Splits
Stabilizing the Knee Joint in Middle Splits
Best Middle Split Stretches to get the Middle Splits Fast!
The Importance of Stabilizer Muscles in Movement Training
Adductor Stretches
How to Get Your Best Middle Split
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Half Side Splits