show route for ... filtered (not working)

[Terra Nova]

 Greetings,

Ubuntu-16.04.6 LTS
bird-1.6.6 (built from source)

Our upstream BGP configuration is using:  import keep filtered on

I was checking the master table for a (filtered) destination IPv6 address
(and network) doing the following.
bird> show route for 2620:0:6b0:ff00::20
Network not in table

bird> show route for 2620:0:6b0:ff00::20 all
Network not in table

bird> show route for 2620:0:6b0:ff00::20 filtered
Network not in table

bird> show route where bgp_path ~ [= * 23028 =]

bird> show route where bgp_path ~ [= * 23028 =] filtered
2604:8800::/32      via 2001:590::xxxx:xxxx on edge.411 [gtt6
01:53:36] * (100 /  95)    [AS 820048060 174 23028i]
2620:0:6b0::/48     via 2001:590::xxxx:xxxx on edge.411 [gtt6
01:53:36] * (100 /  95)    [AS 820048060 174 23028i]

bird> show route filtered for 2604:8800::/32
Network not in table

bird> show route for 2604:8800::/32 filtered
Network not in table

bird> show route for 2620:0:6b0::/48 filtered
Network not in table

bird> show route table master for 2620:0:6b0:ff00::20 filtered
Network not in table

Why will the 'show route' only show this filtered route using 'bgp_path'
and not directly using 'for'?  This route is filtered in the 'master' table
and there are no Pipes being used.  Am I misusing the 'filtered' option?

Thank you for looking.

--
Terra
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