Actually yes,

The Missouri Compromise of 1820 was rendered mute and invalid by the Compromise of 1850, which superceded it. And which among other things, beside the Fugitive Slave Act contained in that compromise, tryed to answer questions about the admission of California.

Since half of that State was below 36^ 30' demarcation line for the admission of Slave and Free States under the 1820 Compromise, this 1850 compromise was necessary for California to be admitted as a single Free State rather than having the State divided along the 36^ 30" line, according to the then existing law, and half admitted as a Slave State and the northern half as a Free State.

You are factually correct. The Kansas-Nebraska act DID repeal the Missouri Compromise of 1820. BUT in practise, as I said, the 1820 compromise was already Null and Void at least as far as the admission of States was concerned, Thanks to special interest legislation regarding the admission of California.

The United States Supreme Court Declared that the Admission of States to the Union as either Free or Slave States as a basis for admission was Unconstitutional in the Dred Scott v Sanford Case.

That it was the individual States right to decide for themselves whether to be a Free or Slave holding state without any regard to a line of demarcation. This decision set the stage that all such laws, not just the Missouri Compromise of 1820, were subject to the same unconstitutional declaration that was rendered.

Hence the Compromise of 1850 and the Kansas Nebraska Act were rendered as being questionable law by the Dred Scott v Sanford decision of 1857.