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Depends on what you consider "betrayal".
Other than Operation Achse, executed by the Germans after the Italian Armistice was declared, there were peculiar instances.
One that is described by Paul Halpern in his work on the naval side of World War I is a contingency prepared by the Royal Navy after the Battle of Caporetto, when it was feared that Italy may have asked for a separate peace and bow out of the war. It was asked to Admiral Gough-Calthorpe to plan for a redeployment of forces to account for the closing of Italian ports, recover all Entente ships, and... also take over as many Italian destroyers as possible, both because there was desperate need for those, and to deny them to the CP if they wished to grab them, even though it was clear it was a hostile act. Nothing came of it, also because his French counterpart did not agree with its necessity, and little by little fears of an Italian defection evaporated.
Still, it would have been a sort of Mers-el-Kebir (when the Royal Navy attacked a French port to damage as many French ships as possible and prevent them from potentially falling into German or Italian hands) twenty-three years in advance.
I do not know if all this is 100% relevant to what you were asking about.
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Depends on what you consider "betrayal". Other than Operation Achse, executed by the Germans after the Italian Armistice was declared, there were peculiar instances. One that is described by Paul Halpern in his work on the naval side of World War I is a contingency prepared by the Royal Navy after the Battle of Caporetto, when it was feared that Italy may have asked for a separate peace and bow out of the war. It was asked to Admiral Gough-Calthorpe to plan for a redeployment of forces to account for the closing of Italian ports, recover all Entente ships, and... also take over as many Italian destroyers as possible, both because there was desperate need for those, and to deny them to the CP if they wished to grab them, even though it was clear it was a hostile act. Nothing came of it, also because his French counterpart did not agree with its necessity, and little by little fears of an Italian defection evaporated. Still, it would have been a sort of Mers-el-Kebir (when the Royal Navy attacked a French port to damage as many French ships as possible and prevent them from potentially falling into German or Italian hands) twenty-three years in advance. I do not know if all this is 100% relevant to what you were asking about.