Referencing "*" in scoreboard operation gives scores to players from other scoreboards

to reproduce:

make score1 and score2 (or similar)

give player test 5 for score1

give player abc 2 for score2

set score1 to the sidebar slot

do /scoreboard players operation cde score1 += * score1

observe, as abc has now gotten a score of 0 int score1

expected behavior: cde becomes the summary of score1, without adding players.