Invalid column name in @tablevariable not throwing error

DECLARE @IDListAll TABLE (allID INT)

DECLARE @filterList TABLE (debtID VARCHAR(200))

INSERT INTO @IDListAll ( allID )
VALUES  (397243),(397245),(397249),(397250),(397252),(397253),(397254),(397255),(403259),(404704),(404709),(500008399)

INSERT INTO @filterList( debtID )
VALUES  ( 12 )

SELECT * FROM @IDListAll
WHERE allID IN (SELECT allID FROM @filterList)

In the code above, I have 2 table variables @IDListAll & @filterList. @filterList table does not have the column allId in it, but the select statement does not throw an error but returns the table @IDListAll. Isn't this weird? 

I am trying to re factor some old code in the database and found this one. This is wrapped in a stored proc and the stored proc generates no error when this is run.

I ran the above code using temp tables, does the same thing.

Can anyone explain this behavior of sql server?