I personally favour an interpretation that leans toward the

De-Broglie Bohm pilot wave theory (rather than the Copenhagen Interpretation).

My interpretation is that every particle contributes to a probability field, within which the probability of a particle existing at a given position (and time) is dependent on the relative situations of all the other particles around it.

In order to produce the double slit effect one has to quite carefully arrange things such that the probability field the particle traverses allows for two essentially equally probable paths.

It is impossible to introduce a detector (no matter how subtle) and maintain that finely balanced probability field.