Hi!
Sometimes external extensions use different hooks, so they don’t detect the search trigger. Often times it can be resolved with a few lines of code, but it depends on the use case.
I don’t have access to that extension though, can you please add temporary sFTP and back-end login details? I will try to debug through the query via editing the search code to see if there is a way to force the results to the blog extras module.
If it’s possible, then I will make sure to fix it for you locally and create a temporary patch until the next release.