Ok I've reproduced this by introducing a delay by changing
/lib/systemd/system/[email protected]

-ExecStart=/bin/sh -ec 'ifup --allow=hotplug %I; ifup --allow=auto %I; \
+ExecStart=/bin/sh -ec '/usr/bin/test %I == bond0 && echo found bond0 && sleep 
3 ; ifup --allow=hotplug %I; ifup --allow=auto %I; \

that reproduces this by allowing bond0.3000 to complete ifup before
bond0 is processed, and when bond0 is ifup'ed it clears bond0.3000's
gateway due to bond0 going down and back up.

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https://bugs.launchpad.net/bugs/1573272

Title:
  default gateway route not installed for bond interfaces through reboot

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