The function "Delete a variable" does not seem to work properly in the case when there is a large number of variables such that the pop up list of variables (from which you click the varaible to be deleted) is displayed only partially, followed by a "more..." sublist.
In this particular case, it systematically deletes the first variable in the list, even if you exit the function by clicking somewhere outside the list. I lost several variables like this untill I realized what was happening.
--- PB (probably not the youngest Scratch user ...)
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Right. It starts happening at the 42nd variable, when the variable display window switches to the "more..." sub-window mode.
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