mockkStatic is not getting unmocked/cleared correctly

Prerequisites

• I am running the latest version
• I checked the documentation and found no answer
• I checked to make sure that this issue has not already been filed

Expected Behavior

After unmocking, I would expect that the SecurityContextHolder is back in its normal operation mode.

Current Behavior

When executing anything on SecurityContextHolder like getContext() after unmocking, a NullPointerException is thrown, as the internal strategy field is not initialized.

Failure Information (for bugs)

Steps to Reproduce

1. You need the dependency for the spring class SecurityContextHolder
2. Write a Junit5 test like below
3. Execute it and you will get the NPE

Context

• MockK version: 1.12.3
• OS: Windows 10
• Kotlin version: 1.6.10
• JDK version: 11-temurin
• JUnit version: 5.8.2
• Type of test: unit test

Minimal reproducible code

import io.mockk.clearAllMocks
import io.mockk.every
import io.mockk.just
import io.mockk.mockkStatic
import io.mockk.runs
import org.junit.jupiter.api.Test
import org.springframework.security.core.context.SecurityContextHolder

class MyTest {
    @Test
    fun test() {
        // Mock
        mockkStatic(SecurityContextHolder::class) // when replaced with mockkStatic(SecurityContextHolder::class.qualifiedName!!), everything works
        every { SecurityContextHolder.clearContext() } just runs  // without this line, everything works

        // Unmock
        clearAllMocks()

        // Try to get SecurityContext -> throws NPE, but should not
        SecurityContextHolder.getContext()
    }
}