TYPO3 Core

It's impossible since version 6.0 to render a FLUIDTEMPLATE content object inside a FLUIDTEMPLATE, because the internal fluid view instance of the parent FLUIDTEMPLATE will be overridden by the children FLUIDTEMPLATE. Patch follows soon...

Test typoscript code:

lib.innerFluid = FLUIDTEMPLATE
lib.innerFluid.template = TEXT
lib.innerFluid.template.value = B

page = PAGE
page.10 = FLUIDTEMPLATE
page.10.template = TEXT
page.10.template.value = A{anotherFluidTemplate}C
page.10.variables {
  anotherFluidTemplate < lib.innerFluid
}