Currently the CPC is anticipating to move into a higher stage of socialism, or becoming a fully socialist country, by 2050. This will obviously change much of China, but how will it effect their foreign policy? China has famously had many bad takes in terms of foreign policy, but their post-Mao non-interventionism is important practically in retaining peaceful and favorable relations with global capital. They know that, even now, funding revolutionaries will only isolate them internationally.
But once China's productive forces are high enough to allow the socialist transition then they no longer have to remain non-interventionalist for practical reasons. They could still try and justify it, but at that stage it would be hard for China to reject the internationalist principles of Marxism. The USSR could afford, to an extent, to wield hard power in support of revolutions and their governments, and of course without the USSR it could be argued that most socialist states would have collapsed soon after gaining state power. The soviets could do this due to their high level of industrialization, military, and global economic power.
When China is able to realize the same stage of socialism as the USSR they will undoubtedly be the largest and strongest economy in the world. While the west will still have some influence and power with which to threaten and hurt China over supporting international socialism, they ultimately won't be in the position of power to isolate China then as they did with the USSR. So there could be even less consequences for Chinese interventionism at this stage. Do you believe, then, that China would adopt foreign policy similar to the Soviet Union? And could even create an international version of the Warsaw Pact, that is an economic and military alliance between socialist states?
From my ignorant non-Chinese POV, there appear to be neither a practical or ideological reason for a fully socialist China not to be internationalist.
Eventually, they will have to, it will be a necessity, socialism and capitalism are the anti-thesis of each other, there cannot be peaceful cooperation between opposites. Of course, there may be mutual agreements, but they're usually short-term. History has shown time and time again that the capitalists will do everything, every time, everywhere to hurt socialists and socialist countries.
When the USSR was at civil war, what the biggest capitalist powers did? They tried to suppress it invading them. China is in the sweet spot where they can enjoy relative safety from western powers due to the economic dependence the west has on China, but that won't remain forever.
You cannot trust the ruling classes of third world countries too, as they have shown to be extremely reactionary everywhere. In the case of my country, Brazil, the ruling class is mostly owners of farmland, one of the worst kind. They cannot be trusted. China will eventually have to gain trustful allies, in this case, socialist countries, they have to help the proletariat of the world eventually.