Only mixture groups seem to be allowed in the webeditor

[ClairePA]

I draw the following structure

and this HELM is generated.
PEPTIDE1{A.C.D}|PEPTIDE2{D.A.C}$$G3(PEPTIDE1+PEPTIDE2)$$V2.0

I want to define alternatives, and not a mixture, so I change the HELM to

PEPTIDE1{A.C.D}|PEPTIDE2{D.A.C}$$G3(PEPTIDE1,PEPTIDE2)$$V2.0
This is valid HELM.

If I apply this HELM to the webeditor it is changed to
PEPTIDE1{A.C.D}|PEPTIDE2{D.A.C}$$$$V2.0

and the structure looks like this:

all grouping information is lost.

[ClairePA]

Update - if I apply the original HELM i.e.
PEPTIDE1{A.C.D}|PEPTIDE2{D.A.C}$$G3(PEPTIDE1+PEPTIDE2)$$V2.0
and click apply, the grouping information is also lost.

The editor can generate the correct HELM, but is unable to interpret it.