Duplicate thread on the same node

Problem/Motivation

The related comments have been saved in the same second and resulted in same thread value.
Just had this issue today on a 10.2.6 website.

This was reported as fixed in 🐛 Possibility of {comment}.thread duplication in the same node Needs work

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes

Release notes snippet