[protobuf] Parser error in java or C# save to binary

[Андрей Баранов]

message Msg_Order
{
message Msg_OrderItem
{
int32 item_id = 1;
int32 count = 2;
int32 price = 3;
Msg_Item item = 4;
}
int32 id = 1;
map<int32, Msg_OrderItem> order_items = 2;
int32 amount = 3;
Int64Value dt_create = 4;
int32 state = 5;
string payment_id = 6;
}

When I parse in Java Msg_Item item = 4; is empty !!!
BUT !!! When I convert
from map<int32, Msg_OrderItem> order_items = 2;
to
repeated Msg_OrderItem order_items = 2;

it begins work !!!! BUG ???

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