This is a fundamental and critical misunderstanding of what Communism is, and what Marx refers to as a State. Marx makes himself clear in Critique of the Gotha Programme, but the State for Marx isn’t just “government.” Marx was vehemontly anti-Anarchist, not out of principle disagreements, but on a practical and rational basis.
For Marx, the State is the element of government by which class society sustains and protects itself. Ie, private property rights, and the police that protect it. Communism would have a government, its own police, and its own structures and administration through central planning. The State whithering away, as Marx puts it, is the slow lack of retaining the former elements of class society. For example, we no longer have Streetlamp Lighters, as streetlamps are electric now. This wasn’t because they were targeted and eliminated, but simply fell out of favor with the progression of society.
Once power is obtained it’s never willingly dispersed. This has been the fate of existing all communist governments
This right here is the crux of your misunderstanding. Carrying over from the whithering away elaboration from my last paragraph, the government is not supposed to intentionally collapse itself, it’s supposed to remain a democratic worker government, and continue to be built up over time.
Different AES states have seen their own issues, but none of them have been due to “not willingly giving up power,” which is a fundamental misconception of how these AES States function, or what the Marxist path to Communism truly is.