The world selection screen (accessed from the main menu Play button) has 3 tabs for Worlds, Friends, and Servers. Each tab has an animated icon and a label.
With the release of 1.17.0, the Friends tab's icon is erroneously duplicated, which pushes the label to the right and nearly cuts it off. Only the left icon is animated.
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This report has been closed as Invalid because it was caused by a third-party resource pack.