As you have noted, this remains a priority fix for Enketo, but I am not aware of any recent progress being made on this front or an ETA for a fix. In the interim if you feel it could be useful to the community to explicitly call out this difference in behavior between Enketo and Kobo/ODK, I might suggest opening as issue against the XLSForm docs about it, and/or submitting a pull request yourself with suitable documentation changes.
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