On a wider screen, Messages can automatically select the first visible conversation when the previous thread is no longer included in the filtered list. This keeps a matching conversation open beside the list.
After changing a search term or status filter, read the title above the message composer before sending. Do not assume the previously selected thread remains active when it has disappeared from the results.
If the wrong thread is selected, clear the filters or choose the intended conversation directly. Review any text already in the composer and make sure it belongs to that conversation. Do not rely on a drafted message to identify its destination.
This behavior changes the displayed selection, not the content of the earlier conversation. You can return to that thread once it is visible again. If you accidentally send to a different thread, post a clear correction and use the available own-message deletion action only if it is still within the permitted window and appropriate for the situation.
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