Snmp timeout when the response port route is different from the input

To explain my problem I created with some RBs that I have at home a very reduced and objective scenario.
Basically the problem occurs across my network where I have 2 routes.
If I register on The Dude an equipment then I change my route, SNMP stops working.
In the examples of the prints the commands were in mAP, looking for SNMP in the IPs away.
snmp cenario1-winbox.PNG
snmp cenario1 ok.PNG
snmp cenario1 erro.PNG