uk citizens – My BNO passport lists my other passports under “observations.” Must I bring those other passports whenever I use the BNO one?

HM Passport Office has issued me a British National (Overseas) passport. I also have a Hong Kong passport, but I do not have actual British citizenship, any UK Visa, nor right to abode in the UK.

As others have mentioned, my BNO passport lists my other passports under the “official observations” section, but I’d prefer to be able to travel without disclosing this information all the time.

Must I carry all those other passports on me if I travel on the BNO passport? After an immigration officer sees the BNO passport and its official observations, will the officer want to see all my other passports listed there?

What if I use BNO when I travel to a country other than the U.K.? For example, if I were to travel to Japan on my BNO passport, would a Japanese immigration officer expect to be able to see the passports listed in this official observations section?