Setting deathCount to display on both the list and sidebar, I noticed a discrepancy between the two while in a team, as shown in the attached images, the issue also seems to affect playerKillCount, as shown in another attached image.
From what I can make out, it seems that the scores stay with the player, irrelevant of the team, with the sidebar displaying the score with the player's coloured name, while the list displays the player's team score, which does not increase.
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Duplicate of MC-8831, please use the search function to see if your bug has already been submitted. Currently over 54% of tickets are being closed as duplicate.
I can confirm this. This bug is really annoying for people who want a form of currency using scoreboards.