Branch,Tags,Wiki Attachments,Issues Attachments missing after upgradation from GItLab 13.6.7 to 15.0.1

GitLab update performed from 13.6.7 to 15.0.1
In the current version, repos are migrated from legacy storage to hashed storage.

Updates performed in below manner to reach latest version

13.6.7 (Current Version)
13.9.2
13.12.15
14.0.12
14.5.0
14.9.0
14.10.4
15.0.1 (Latest Version)

Observations:
Some of Branch,Tags,Wiki Attachments,Issues Attachments missing after upgradation from GItLab 13.6.7 to 15.0.1