The reason is that master is connected to reconfig_avmm. The following two routes are shown on TTK.
TTK can be used even if reconfig_avmm is left open.
(1) How to use TTK using the route of reconfig_avmm
(2) How to use TTK without using the route of reconfig_avmm
--------------------
Category: Transceivers
Tool: Quartus® Prime
Device: Arria® 10