I am seeing different behaviour regarding the output of fluid field variables when used inside a sub-field, depending upon whether that sub-field has a single ‘content’ tag or whether it uses a tag pair. Eg, in the following:

{my_fluid_field}
    {my_fluid_field:sub_field}
      {my_fluid_field:current_field_name}
     {content}
    {/my_fluid_field:sub_field}
{/my_fluid_field}

The current_field_name variable correctly outputs the name of the subfield that it is in. But in this:

{my_fluid_field}
    {my_fluid_field:sub_field}
      {my_fluid_field:current_field_name}
     {content}{/content}
    {/my_fluid_field:sub_field}
{/my_fluid_field}

It does not.

Is this a bug? I guess I might be using the variable tags in the wrong way — to be honest the docs are bit thin in this area and knowing quite how to structure the syntax is not entirely obvious — but the above issue does seem like it might be a bug. (If it’s not, though, could somebody maybe bulk-up the documentation to make it a little clearer how those variables should be used? I received various pieces of helpful of advice on that from the Slack channel, but it often contradicted other people’s advice or the docs themselves, and nobody seemed to be 100% certain).