Custom issue type icons will look bigger than the default ones

Issue Summary

Custom icons uploaded to Jira meant to be used as issue type's icons will look bigger than the default ones.

That happens because the default icons have a white border around them:

It is not noticeable because of the UI being white.

The different will be noticeable when comparing a custom icon with the default ones:

The icons actually have the same size since Jira will resize the image to 16x16, but the white border will impact in the visualisation.

Environment

Jira Cloud.

• Next-gen projects
• Classic Projects  

Steps to Reproduce

• Upload a custom icon to an issue type;
• See the difference in a view like in the backlog.

Expected Results

The icons should not have such disparity.

Actual Results

The custom icons will always look bigger.

Workaround

The only way to have the custom icons actually match with the default ones in the UI, it would be necessary to have white borders on them as well.