Same (unexpected behaviour) from Orient 2.0-rc1 and command line:
orientdb> create database memory:temp
Creating database [memory:temp] using the storage type [memory]...
Database created successfully.
Current database is: memory:temp
orientdb {db=temp}> select from v
0 item(s) found. Query executed in 0.001 sec(s).
orientdb {db=temp}> insert into v(name) values ("luca")
Inserted record 'V#9:0{name:luca} v1' in 0,002000 sec(s).
orientdb {db=temp}> insert into v(name) values ("riccardo")
Inserted record 'V#9:1{name:riccardo} v1' in 0,001000 sec(s).
orientdb {db=temp}> alter database custom useLightweightEdges=true
Database updated successfully
orientdb {db=temp}> create class knows extends E
Class created successfully. Total classes in database now: 11
orientdb {db=temp}> create edge knows from #9:0 to #9:1
Created edge '[e[#9:0->#9:1][#9:0-knows->#9:1]]' in 0,026000 sec(s).
orientdb {db=temp}> select from e
0 item(s) found. Query executed in 0.001 sec(s).
orientdb {db=temp}> select out().size() from v
----+------+----
# |@CLASS|out
----+------+----
0 |null |1
1 |null |0
----+------+----
2 item(s) found. Query executed in 0.003 sec(s).
orientdb {db=temp}> create edge knows from #9:0 to #9:1
Created edge '[e[#9:0->#9:1][#9:0-knows->#9:1]]' in 0,008000 sec(s).
orientdb {db=temp}> select from e
0 item(s) found. Query executed in 0.0 sec(s).
orientdb {db=temp}> select out().size() from v
----+------+----
# |@CLASS|out
----+------+----
0 |null |2
1 |null |0
----+------+----
2 item(s) found. Query executed in 0.002 sec(s).
orientdb {db=temp}> select from #9:0
----+----+------+----+------------
# |@RID|@CLASS|name|out_knows
----+----+------+----+------------
0 |#9:0|V |luca|[#9:1, #9:1]
----+----+------+----+------------
1 item(s) found. Query executed in 0.0 sec(s).
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