Well, then, if you're going to include nearly completely ethnically German border areas with Czechoslovakia and Poland, why make a corridor to separate Spremberg from Lusatia, or even separate the two Lusatias at all?
That's certainly a possibility that there would be no corridor to separate them and that there might not be separate Lusatias at all, but as with North and South Ossetia and Armenia and Nagorno-Karabakh and as happened in Yugoslavia, Romania and China (where Tibetans, Mongols, Koreans and a bunch of other titular autonomous ethnicities are divided across a number of autonomous territories and shared their territories with Han Chinese and other groups and were sometimes only a plurality rather than majority even in their "own" autonomous territory), it was not unusual that titular autonomous groups often shared their autonomous areas with other ethnic groups and that titular autonomous groups were sometimes split between two or more autonomous regions.
In the case of East Germany I can't see any Lusatian autonomous regions being formed across Lander borders before the 1950s. So if Stalin supported it, it would likely be a Lower Lusatia autonomous district formed within the Land Brandenburg Land and an Upper Lusatia autonomous district formed within the Land Saxony (much as how you had a North Ossetian autonomous oblast in the RSFSR and a corresponding South Ossetian autonomous oblast in the Georgian SSR/Trancasucasian SFSR). Whether they would be unified with any reorganization after the 1950s is anyone's guess (though the fact that there is an Upper Sorbian language and a Lower Sorbian language might help to give inertia to keeping the two autonomous regions separate even if they border each other). However, I would imagine that a Stalin that was okay with Lusatian autonomy might also wish to have the Lusatian autonomous regions actually border Czechoslovakia and Poland and thereby act as a kind of insurance incase East Germany was being lost in a revolt (the two regions could be pried off and added to Poland/Czechoslovakia or form regions from which the Soviet Army might find generally a more loyal base of support from which to prosecute operations to put down any revolts in Germany). At the same time if say in Upper Lusatia, the Sorbs formed maybe 60% of the population it would mean that the authorities in East Germany would be more confident about being able to have ethnic Germans in key leadership positions within the autonomous region simply because ethnic Germans formed 40% of the population and thus a Central Committee of the Upper Lusatian Communist Party being equally split between Sorbs and Germans won't seem like clear minority rule (insofar as the East German communists would be concerned about the appearances of minority autonomy and participation in the communist party system).
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