Let's handwave and posit a world where Bela Kun's Hungarian Republic of Councils survived and was connected with Soviet Russia by a Soviet Ukraine that included both Carpatho-Ruthenia and the extreme southeast of OTL interwar Poland. In such a world, with Soviet power extending almost to Vienna, Czechoslovakia might be much more anti-Communist than in OTL and the other members of the Little Entente might be even more worried about Communism than they were in OTL. So they would see any disagreements with Italy (concerning, say, the Italo-Yugoslav border) as less important than creating a solid anti-Communist bloc in central Europe including Fascist Italy...
I might add that even in OTL, good Soviet-Czechoslovak relations did not come about until well into the 1930's. "At the beginning of the existence of both states, their relationship was bad. There was strong animosity sourcing from the armed conflict between
Bolshevik authorities and
Czechoslovak Legions and from the following participation of the Legions in the
allied intervention against Bolsheviks. Moreover,
Karel Kramář, Czechoslovakia's 1st Prime Minister, disliked the Bolshevik regime for personal reasons (his wife came from Russian nobility). Czechoslovakia recognized the Soviet Union (USSR)
de jure not until 1934..."
https://en.wikipedia.org/wiki/Czechoslovakia–Soviet_Union_relations
Indeed, for Czechoslovakia--as for another multinational state produced by Versailles, Yugoslavia--the Comintern for a while actually advocated the breakup of the state: "The same is true of Czechoslovakia, another multinational state. There the 1929 Party Congress adopted the slogan of 'self-determination even to the point of secession' and denounced Czechoslovakia as an imperialist state, and in 1931 the party called for the 'reunification of German, Hungarian and Polish populations under Soviet power', and a 'Soviet Slovakia'..."
https://www.history.ac.uk/reviews/review/423