m0useanswered grow question 6 months ago Just because something is listed as it does not always mean it will be effective.
This is a snip it from google.
Bacillus subtilis GBO3 is a bacterium that is used as a fungicide on flower and ornamental seeds, and on agricultural seeds including seeds for cotton, vegetables, peanuts, and soybeans. The bacterium colonizes the developing root system of the plant and thus competes with certain fungal disease organisms.
Maybe the bacteria does not interfere with none pathogenic fungal species of the plant. Or maybe they're not good at combating the ones in the other product.
These where a few study done about this. foot note, I did not read them but it might have the information your looking for given the title, but it does use very specific spices of fungus and bacteria. IDK if yours are the same. different strains of the same bacteria can have different results, so best to not over think it.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7145286/
and another one
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9780869/
High Phosphorus content in the medium will prevent a lot of mycorrhizae from even growing. and most cannabis feed are high P in flower so I don't think you have much to worry about, I would still use all the products but maybe do a test of it first on one plant first and see how it does. Give it a week or two to show any issues.
Good Luck!