What significant physical issue caused the earlier Laplacian model to encounter difficulties?

Answer

The planets hold 98% of the total angular momentum, while the Sun holds only 2%

The Laplacian model struggled because rigorous application of physics revealed a major discrepancy: the Sun contains over 99% of the mass but possesses only about 2% of the total angular momentum, with the planets holding the vast majority.

What significant physical issue caused the earlier Laplacian model to encounter difficulties?
solar systemformationhypothesiscreation