If I am testing something I believe works and is ready, prior to testing, I will tell you it is almost ready.

Then if we test it and it fails acceptance testing, I might learn there is a problem that takes some time to fix.

I did not arrive at a biased decision; I had priors that I used to make an estimation, which turned out to misleading.

The judge is exactly this case. They guess the time it will take to rule; it doesn’t have to mean their eventual ruling is biased.