Pretty self explanatory really. Just can't do it. Got an error saying "Invalid Characters". Is this some database issue behind the scenes?
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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
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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