We do not generally use the future tense "will ~" after this kind of "when", even if we are talking about the future (there are certain exceptions, such as questions). Your suggestion "... " might seem to be logically correct, but in fact we don't say this.
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We do not generally use the future tense "will ~" after this kind of "when", even if we are talking about the future (there are certain exceptions, such as questions). Your suggestion "... when you will go ..." might seem to be logically correct, but in fact we don't say this. There is no obvious logical explanation: it is just something you have to learn.