I feel the need to refer to this concept regularly in quite different situations, so I feel that there probably is a word.
Example 1 (silly engineering one)
I want to know how fast my paper aeroplane flies so I attach my smart phone to it with an app to measure speed. The plane does not fly any more because the measurement device is far too heavy; the plane's behaviour is altered by the measurement device.
The method suffered from X.
Example 2 (human one)
I want to know what people think about something at work so I ask a question. If I ask the same question but follow it with "I want to tell the management what people think" then in some situations this is likely to affect how people answer. The questioning suffers from X.