Create a new custom field (in that case, a radio button) and associate it with two different projects, with a different default value to each one. When you are creating a new issue, the first screen shows the right default value of this radio button, but if you change the project, it doesn't change.

Steps to replicate:

• Create a new custom field and associate it with two different projects with a different default value for each one:

• Create a new issue. The first time will show the right default value of this custom field:

• Change the project. The custom field will not show the right default value (in my test, it doesn't show any value):