ListFields returns old field names after using AlterField tool.
Do you want the shorter, truncated field names or the full field name (a bit more descriptive)?
Did you specify the alias when you altered fields?
I am truncating the fields having the length of the name is more than 10. I did it because i could not alter the field names during data migration. I am expecting truncated field names after alter field tool execution. It actually happened, But List Fields could not get the changes
I did not specify aliases.
What happens if you alter the name and the alias? since both are parameters
Alter Field—Data Management toolbox | ArcGIS Desktop
there are also a number of bugs associated with alter field, if you want to have a look
Retrieving data ...