I'm upgrading from wp4 to wp6, and am creating a merge field in code. The ReplacementVar is a string, and in ongettext, I provide a value.
The problem is, when I'm editing the mergetemplate, I don't see the name, just the <<>> delimiters. Existing templates do display the name, but when I add a new field to the existing template, it doesn't show.
Later ..
Ok, I found this and it works. Does seem pretty wierd, considering that the manual implies this is the default behavior: