Pretty self explanatory really. Just can't do it. Got an error saying "Invalid Characters". Is this some database issue behind the scenes?
Couldn't find any documentation on it but drop is basically "delete" in sql (https://www.w3schools.com/sql/sql_drop_table.asp) so I suspect that's why it's considered invalid. I can confirm I can't export a 'drop' feature class either, it'll work if you add a suffix though.
Looks like it is a SQL reserved word:
https://support.microsoft.com/en-us/office/sql-reserved-words-b899948b-0e1c-4b56-9622-a03f8f07cfc8
And if you try to create a fGDB Feature Class called Drop, it says "name cannot be a keyword" for the error - so it's a reserved word as well in a fGDB too.
And this Esri blog article details the different Reserved Words that apply in different circumstances.
https://community.esri.com/t5/esri-technical-support-blog/words-by-reservation-only/ba-p/898664