Hi @Vero,
I did reinstall Alfred from scratch but that didn't change anything, still, the snippets are not triggered. The strange part is that on the other mac i have the same setup, also upgraded to Mojave from High Sierra and there the snippets are expanded without any issue. I checked also the settings in both machines and they match exactly, so i'm clueless why only on the MacBook I see this problem.
Cheers,
Ovi