Wikimedia Bugzilla is closed!

I'm using a multiple form inside of another form and the UI works well, but the template it produces is broken. The form is like this (sorry for no link, the wiki this is on isn't publicly available):

{{{for template|Foo}}}
A: {{{field|A}}}<br/>
B: {{{field|B}}}<br/>
SpecialStuff: {{{field|Special stuff|holds template}}}<br/>
{{{for template|Specials|multiple|embed in field=Foo[SpecialStuff]}}}
X: {{{field|X}}}<br/>
Y: {{{field|Y}}}<br/>
{{{end template}}}
C: {{{field|C}}}<br/>
D: {{{field|D}}}<br/>
{{{end template}}}

This works fine and is awesome in the form UI. However, the template that it writes is problematic because the "inner template" closes out the outer one. You get something like.

{{{Foo
|A=A
|B=B
|SpecialStuff={{Specials
|X=1
|Y=2}}{{Specials
|X=5
|Y=6}}
}}

|C=C
|D=D
}}

Obviously the last half is orphaned.