Claude's thinking bubble is now disappearing entirely on some messages, with no changelog entry

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A 204-upvote r/ClaudeAI thread reports that after the full thinking chain was compressed to a one-line summary, the thinking bubble now fails to appear at all on some messages, while the reasoning tokens are still billed. The subreddit's auto-generated summary after 30 comments records the consensus as agreement that the behaviour changed and that no announcement accompanied it, and parallel threads ask whether extended thinking was removed from Sonnet 4.6 as well. For anyone parsing thinking blocks programmatically this is a silent contract change, not a UI preference.