Why were the patch versions for CVE-2019-13126 released so late?

[Silence-worker-02]

Hello, we are a research team working on Golang. During our investigation, we found CVE-2019-13126 was addressed in commit 07ef71f. However, we noticed that the patch version (v2.2.0) was released after long time (286 days). We are curious about the reasons behind the delayed release of the patch version, as it may hinder the efficient distribution of patches to downstream users. Could the reason be

1.Issues with testing and CI checking.

2.Other commits have to be incorporated into one release.

3.By convention, versions are not frequently released.

4.Other reasons.

Thank you for your attention, and we look forward to receiving your reply.