I seem to have an example in progress:
Last month I posted an idea of what might have caused the recent SpaceX anomaly in the
SpaceX needs us thread, a subject on which I have no specialist experience. Unlike most posters both on that thread and on the Nasa forums, I thought the initial problem was not the explosion as seen but rather a very sudden failure in the helium pressure system, and that the explosion came a few milliseconds afterwards as a result of the second stage being ruptured, causing ejection of a significant amount of LOX and fuel mixture which could then ignite trivially easily, for example as a result of heat from rupturing materials. I also later mentioned that the failure could have been triggered by thermal stresses during LOX loading.
So far, this hunch has not been confirmed, but as far as I know it is now the main line of inquiry.