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Yes: One mechanism hangups use is hiding themselves from their holder. Sometimes you can't even tell directly anything is wrong (only have indirect evidence there's a hangup), let alone *what* is. This makes it harder to find and change them, increasing their stickiness.
This definitely isn’t the case for a lot of the the phenomena we call biases, though. Many of them (e.g. planning fallacy) are famously unmitigated by awareness of them
That's because the described bias is not actually the mistake. In the case of 'biases', usually what's going on is something more detailed and nuanced. *Sometimes* the bias does describe it, but then recognising it helps.
Though being aware of a hangup doesn't always help! Hangups use other mechanisms too (and may not use this one).
Cognitive dissonance is a big bad erroneous, often-unmitigated bugger as well
Planning fallacy seems to me to result from the fact that estimating time is really hard and in some sense impossible since unexpected things always happen and can't be really taken into account in an actual prediction.
The interesting thing is that people rarely if ever adjust for unexpected barriers, which occur frequently enough that they should be... expected :)
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