This is a screenshot from the results and the debug console. It founds 4 results, but only 3 are shown. The one missing isbn is not shown. When I generate a dummy isbn, it will show up. The only difference is, that I set the mi.isbn and call the cache_isbn_to_identifier method. Even if I call the cache_isbn_to_identifier, if the mi.isbn is not set, it will not show up.
https://pasteboard.co/iwmtkHP8tOqU.png
At the end, it says this:
```
************************************************** ******************************
The identify phase took 9.04 seconds
The longest time (8.853095) was taken by: Martinus.sk
Merging results from different sources
We have 3 merged results, merging took: 0.00 seconds
```
So it somehow merged the results? But why?