I've not been able to find anything about it being debunked. Wikipedia[0] says
> A 2012 study at the University of Rochester (with a smaller N= 28) altered the experiment by dividing children into two groups: one group was given a broken promise before the marshmallow test was conducted (the unreliable tester group), and the second group had a fulfilled promise before their marshmallow test (the reliable tester group). The reliable tester group waited up to four times longer (12 min) than the unreliable tester group for the second marshmallow to appear.[11][12] The authors argue that this calls into question the original interpretation of self-control as the critical factor in children's performance, since self-control should predict ability to wait, not strategic waiting when it makes sense.
but it sounds like the original experiment controlled for the trust factor so I don't really think it shows that the original results were invalid.
Having said that, I've not done a huge amount of research into this so maybe take my opinions with a grain of salt or two.
> A 2012 study at the University of Rochester (with a smaller N= 28) altered the experiment by dividing children into two groups: one group was given a broken promise before the marshmallow test was conducted (the unreliable tester group), and the second group had a fulfilled promise before their marshmallow test (the reliable tester group). The reliable tester group waited up to four times longer (12 min) than the unreliable tester group for the second marshmallow to appear.[11][12] The authors argue that this calls into question the original interpretation of self-control as the critical factor in children's performance, since self-control should predict ability to wait, not strategic waiting when it makes sense.
but it sounds like the original experiment controlled for the trust factor so I don't really think it shows that the original results were invalid.
Having said that, I've not done a huge amount of research into this so maybe take my opinions with a grain of salt or two.
[0]: https://en.wikipedia.org/wiki/Stanford_marshmallow_experimen...