Form: Default value don't work in data field

Hello Team,
The default value on data field (may be other) don't work with a field reference.
https://www.clubvosgiengiromagny.fr/index.php/testforum
Clic on "Nombre d'adultes 2"
Write on field data "Nom Adulte1"
No replication on "Nom Adulte2" field who have field7 (Nom Adulte1) on his default value

Thanks to watch this
Regards
Claude

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