Fix snapshot transition bug

[laumair]

Description

Cancellation of snapshot transition during address generation lead to a possibility of attaching addresses of a different account. This PR fixes the problem.

Type of change

• Bug fix

How Has This Been Tested?

• Added unit test coverage
• Manually tested on iOS (dev mode)

Checklist:

• My code follows the style guidelines for this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• For changes to mobile that include native code (including React Native modules): I have verified that both iOS and Android successfully build in both Debug and Release modes
• For changes to shared: If applicable, I have verified that my changes are implemented correctly in desktop and mobile