My world that was originally imported from the "Minecraft Nintendo Switch Edition" when the current Minecraft release initially came out states that the "Content active in this world cannot be used in cross-platform multiplayer." even though there is nothing of the sort enabled.

I've only noticed this recently as I just attempted to use this world online. I have tested newly importing that original world and it does not generate this multiplayer issue. I am assuming the fix for that issue is mentioned here: MCPE-34641

My concern is that I want all the progress I've made in my current world that was originally imported years ago to be playable cross platform.