If you try to use two `store` subcommands in one `execute` command (for instance, to store the success count and the result of the same command), only the last store will work; the first will be ignored.

As a use case, I discovered this while trying to deal with an inventory's item stack counts. I have no way of knowing whether Items[i] exists for a given index i, but if it does, I want to add its Count tag to a score. Since there's nothing like `execute store add`, I needed to first store the result of `data get block ~ ~ ~ Items[i].Count`, then add the result to my running tally. But if there is no Items[i], that will fail and the value in the score won't be accurate for adding.

I thought I should be able to do this: `execute store result score @s Count store success score @s Success run data get block ~ ~ ~ Items[i].Count`, then I could conditionally add Count to the total if Success is positive. But that's when this bug showed up and I realized only the last `store` subcommand will work, not all of them.

*To Reproduce*
1. Set up the Count and a Success dummy scoreboard objectives.
2. From inside a chest block (or other inventory), run `execute store result score @s Count store success score @s Success run data get block ~ ~ ~ Items[0].Count`.

Expected Result: If the chest is empty, @s Success will be 0; if it's not empty, @s Success will be 1 and @s Count will be the size of the first item stack.

Actual Result: Success will be properly set to 1 or 0, but Count will never be set to the size of the stack, as that store subcommand is ignored.