jamstock fdubosc it is possible that Google may have made changes when updating Play Services or GBoard.
I will endeavour to test myself later but as I don't use GBoard and only tested this solution at the time to provide advice it would be profitable to have a regular user of the feature who is on the latest version of the OS, Play Services and GBoard to validate if this is indeed an issue from an update or is simply a configuration issue.
I will respond later tonight when I am back from doing my site visits at work.