Items that do not have tag:{} can not have data stored on them with execute store, the following command should store test:1b on the first item on my hotbar.
/execute as @p store success entity @s Inventory[{Slot:0b}].tag.test byte 1 run gamerule randomTickSpeed
I checked this with the following command and got the output below.
/data get entity @p Inventory[{Slot:0b}]
#output: {Slot: 0b, id: "minecraft:redstone", Count: 64b}
However if put an item in that slot that has tag:{}
/replaceitem entity @p hotbar.0 minecraft:redstone{} 5
#item data: {Slot: 0b, id: "minecraft:redstone", Count: 5b, tag: {}}
Then run the same command
/execute as @p store success entity @s Inventory[{Slot:0b}].tag.test byte 1 run gamerule randomTickSpeed
#item data: {Slot: 0b, id: "minecraft:redstone", Count: 5b, tag: {test: 1b}}
This was discovered while attempting to clear an item from the player only if the item has no data, the command below for example matches items with tag:{}
/clear @p minecraft:redstone{} 0
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