hong kong citizens – BNO passport lists my other passports under OBSERVATIONS. Must bring those other passports whenever I use BNO?

HM Passport Office issued me British National Overseas passport. I have Hong Kong passport. I DON’T have actual British citizenship! NO UK Visa, NO right to abode in UK.

I want to confidential. I don’t want to say what countries passports list under OFFICIAL OBSERVATIONS. https://travel.stackexchange.com/a/153369. https://travel.stackexchange.com/a/133192.

Do I must carry all those other passports on me if I travel on BNO? After immigration officer sees BNO and OFFICIAL OBSERVATIONS, will officer want to see all my other passports under OFFICIAL OBSERVATIONS?

What if I use BNO when I travel to country NOT U.K. ?What if not UK immigration officer sees BNO and OFFICIAL OBSERVATIONS? What if I fly to Japan and show Japanese immigration officer BNO?