Oh okay thats great to hear! I had ChatGPT do most of my trip planning and it seems to be wrong about that aspect, as on NRT's website it seems to only say carry on baggage will be searched.

I was able to call Singapore Airlines and get them to interline my tickets. She said that it won't show up on my end but it's linked on their end; she also said that I will be able to check luggage from LAX-NRT-TPE. However she did say that on the day of the flight I need to confirm with the check-in agent at LAX to make sure my two flights are interlinked and that my luggage will be tagged correctly. If anyone is able to confirm that they've checked luggage through NRT or on SQ on separate tickets and airlines that would be great; I'll also check in with the SQ forum, thanks for the suggestion!