[BUGFIX beta] Avoid breaking {{-in-element}} usage #18727
Merged
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The intimate
{{#-in-element}}
API previously defaults to appending to the remote element without clearing. With the VM upgrade, the default has changed to clearing the remote element as specified by the RFC. Since we are not ready to promote the public API yet, we should preserve the existing behavior and let addon authors migrate to the new public API directly when it is ready.