Describe the bug
FRRouting ignore flag noprefixroute on the interface and use prefix as connected route. But there is no route in the kernel. This behavior causes routing loops when using dynamic routing.

• Did you check if this is a duplicate issue?
• Did you test it on the latest FRRouting/frr master branch?

To Reproduce

1. Add an address in the interface:
   ip add add 192.168.0.1/24 dev eth1 noprefixroute
2. Check the route in the kernel:
   ip ro list match 192.168.0.0 table all
   The command output is empty
3. Check the route in FRRouting:

>vtysh
host# show ip route 192.168.0.0
Routing entry for 192.168.0.0/24
  Known via "connected", distance 0, metric 0, best
  Last update 00:03:32 ago
  * directly connected, eth1

Expected behavior

Zebra should not add connected routes if noprefixroute flag is set

Versions

• OS Version:
  Debian 12

• Kernel:
  6.1.0

• FRR Version:
  9.1