Tab-complete doesn't work correctly for /playsound

When aiming at a block and tab-completing the playsound command, the first coordinate of that block is skipped.

Code analysis: https://bugs.mojang.com/browse/MC-95554?focusedCommentId=293058&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-293058