with the game update there was a problem with a command such as "/give @a[tag=item,tag=!not,scores=

{item=1202}] snow 1" and all old command blocks with tag are not taken into account

Thus, the command is not executed correctly and looks like this:
"/give @a[scores={item=1202}

] snow 1"

and now to fix my command blocks I need to destroy each one and re-insert the command