NSSA default-information-originate nssa-only keyword

The task solution shows the nssa-only keyword being used on R1 and R2 (the ABRs). The rationale in the solution guide is to clear the P-bit and prevent type 7 to type 5 translation.

When I configure this without the nssa-only keyword, it already appears the P-bit is cleared. I can't think of any reason that the nssa-only keyword is required here. Anyone have any thoughts about this?

R1#show ip ospf database nssa-external 0.0.0.0

OSPF Router with ID (192.122.3.1) (Process ID 100)

Type-7 AS External Link States (Area 121)

LS age: 982
Options: (No TOS-capability, No Type 7/5 translation, DC, Upward)
LS Type: AS External Link
Link State ID: 0.0.0.0 (External Network Number )
Advertising Router: 192.122.3.1
LS Seq Number: 8000000D
Checksum: 0x3F27
Length: 36
Network Mask: /0
Metric Type: 2 (Larger than any link state path)
MTID: 0
Metric: 1
Forward Address: 0.0.0.0
External Route Tag: 0

LS age: 1871
Options: (No TOS-capability, No Type 7/5 translation, DC, Upward)
LS Type: AS External Link
Link State ID: 0.0.0.0 (External Network Number )
Advertising Router: 192.122.3.2
LS Seq Number: 80000001
Checksum: 0x5120
Length: 36
Network Mask: /0
Metric Type: 2 (Larger than any link state path)
MTID: 0
Metric: 1
Forward Address: 0.0.0.0
External Route Tag: 0

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