Bug with L2TP Server Binding

CCR1009-8G, 6.39, 6.39.2
I have two interfaces (Type:L2TP Server Binding):
l2tp-in1
l2tp-in2

but sometimes instead of l2tp-in2 i see dynamic interface:
l2tp_sb.png

It’s not really a bug - the router ran out of available static bindings when the client started reconnecting before the server had timed out.

Either create a secondary interface for each user or set only-one in ppp profile to yes.