IAT scores can be changed by the ambiguous attribute response labels of an unrelated preceding mindset task, so observed change may reflect the measure rather than the attitude.

Evidence

Malleability of Attitudes or Malleability of the IAT? (PMC / Perspectives on Psychological Science)

XREF: connects to: To what extent does environmental visual adaptation (e.g., living in extreme high- or low-chroma landscapes) shift an individual’s implicit cognitive associations between achromatic light and moral valence?; IAT scores fluctuate with one’s current context and are better measures of biases held by places than biases held within minds. — The Implicit Association Test; Han, Olson, and Fazio established that the attribute response labels typically employed in the IAT contribute to the malleability of the IAT, clouding inferences about attitude change. — https://psycnet.apa.org/record/2010-03210-006 (+1 more)

Han, Olson, and Fazio established that the attribute response labels typically employed in the IAT contribute to the malleability of the IAT, clouding inferences about attitude change. (similarity 0.97)
The IAT as conventionally implemented is open to multiple interpretations and can provide contextually malleable measurement outcomes, distinguishing the malleability of the measure from the… (similarity 0.94)
IAT scores fluctuate with one’s current context and are better measures of biases held by places than biases held within minds. (similarity 0.92)
Implicit associations reflected in the IAT are influenced by societal messages, life experiences, context, and other environmental factors. (similarity 0.87)
IATs lack psychometric evidence of construct validity; at best 36% of variance in a single IAT may reflect implicit attitudes, and the proportion could be 0. (similarity 0.87)
The original IAT paper (Greenwald, McGhee & Schwartz, 1998) introduced response labels like ‘pleasant’ and ‘unpleasant’ assuming these unambiguously measured association strength and implicit… (similarity 0.87)
Analysis of 4 million IATs (2004-2016) shows American implicit attitudes toward race, skin tone, and sexuality became less biased over time, tracking cultural trends. (similarity 0.80)