Summary

If a user has a local avatar (not set in the Atlassian account), and its username changes at some point, the avatar will break:

Steps to Reproduce

Have the username changed (e.g. by a migration).

Expected Results

The avatar won't be affected.

Actual Results

The avatar image breaks.

Workaround

Set an avatar directly in the Atlassian account.

• Profile icon -> Profile:
  
• Click to change the avatar: