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You did not show the value of the resistor used at the base of the transistor, but at least with microcontrollers of the 16F family it is well known that the ISCP bus can be shared with other circuits, as long as they are separated by a resistor of 10K or higher; therefore you should select the BC846 transistor with the maximum HFE possible (i.e, group B from NXP) in order to saturate in the worse condition.
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