Natvis unable to parse C structs defined like 'struct XXX'

Consider we have struct (I am talking about C language, not C++):

struct __STKFRM__
{
	uint32_t r4, r5, r6, r7, r8, r9, r10, r11;
 ................
};

Both variants struct __STKFRM__ and __STKFRM__ of Name attribute in natvis Type rule does not produce expected result (it just ignores the rule).

The log contains the following lines:

1: (3662) <-1020-var-create - * "Running->psp"
1: (3688) ->1020^done,name="var1",numchild="16",value="0x2000465c <DisplayTaskStack+860>",type="struct __STKFRM__ *",has_more="0"
1: (3688) ->(gdb)
1: (3688) 1020: elapsed time 26
1: (3691) Natvis failed to parse typename: struct __STKFRM__ *

If I define the struct using typedef everything works.

The issue concerns Natvis parsing of the Name attribute for C struct types, with the GDB log showing struct __STKFRM__ * rejected. Start by reproducing the shown struct and testing both Name forms against the typedef case; done when tagged C struct names are accepted by Natvis.