issue: 3594311 Fix segfault for delegate incoming handshake failure

[AlexanderGrissik]

Description

Seg fault fix for delegated timers and cleanups

What

See commit comments.

Why ?

Crash fix for Nginx Proxy

Change type

What kind of change does this PR introduce?

• [X] Bugfix
• [ ] Feature
• [ ] Code style update
• [X] Refactoring (no functional changes, no api changes)
• [ ] Build related changes
• [ ] CI related changes
• [ ] Documentation content changes
• [ ] Tests
• [ ] Other

Check list

• [X] Code follows the style de facto guidelines of this project
• [X] Comments have been inserted in hard to understand places
• [ ] Documentation has been updated (if necessary)
• [X] Test has been added (if possible)

[AlexanderGrissik]

bot:retest