Doing a 1 line command that checks for multiple entities (by chaining "as") does not work in command blocks. It does however work when it's done in chat.
The command I used was
/execute as @e[type=item,nbt={Item:{id:"minecraft:flint"}}] as @e[type=item,nbt={Item:{id:"minecraft:feather"}}] as @e[type=item,nbt={Item:{id:"minecraft:stick"}}] run say "Propagated between Flint, Feather, and Stick"Video is here
Edit: Despite the video showing a conditional command block (which is default, by the way), it doesn't work with an unconditional block either
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Did you even attempt to replicate it? I just tried it conditional and not, it still behaves the same. This is not invalid.
The command block shown in the video is conditional