Snippet function worked couples of days ago (4.2.0), this issue very possible due to new version released (4.2.1 in 13th November)
Mac Version:
$ sw_vers
ProductName: macOS
ProductVersion: 11.0.1
BuildVersion: 20B29
Alfred Version:
Alfred 4.2.1 [1187]
Permission check:
Example:
Result:
https://github.com/marslo/marslo-test/blob/issues/screenshots/alfred/snippets-not-work-mac-11.0.1.gif (upload limitation for accessory size)