Optional macro parameters in ifdef block give error with 'lreg' function

[oxidaan]

The sample below is taken from the assembler macro documentation, demonstrating optional parameters at Push macro.
(For simplicity I removed r3, r4)
Inside there, I added (for both parameters):
add a, lreg({{r1}})
When called with one parameter, this gives an error 'Unexpected token '$$' despite being withing the ..if def({{r2}}) block.
I think this should not give an error.
To reproduce: assemble this code:

; Code file
start: .org #8000

Push:
.macro(r1, r2)
.if def({{r1}})
add a, lreg({{r1}})
push {{r1}}
.endif
.if def({{r2}})
add a, lreg({{r2}})
push {{r2}}
.endif
.endm

Push(bc)

[Dotneteer]

Sorry for ignoring your request for a such a long time. As I still do not know when I will have time to release the next preview, here I send you a private build with the fix. Please, rename the .zip file to .vsix before installing it!

Spect.Net.VsPackage.zip