Dotted circle is inserted between Gurmukhi udaat and vowel sign

[dscorbett]

A dotted circle is inserted after the udaat and before the vowel sign in ⟨ਕੑੇ⟩ (U+0A15, U+0A51, U+0A47). The Unicode Standard recommends this order, so there should be no dotted circle: “U+0A51 GURMUKHI SIGN UDAAT [...] should occur after the consonant to which [it] attaches and before any vowel sign.”

[KrasnayaPloshchad]

Conifrmed. With BabelPad and Nirmala UI I can see the desired example:

But with the latest hb-view utility I can see dotted circle:

If I change the order to U+0A15, U+0A47, U+0A51, both BabelPad and hb-view works as expected, no dotted circle appearing.

[jfkthame]

U+0A51 GURMUKHI SIGN UDAAT seems to be missing from IndicSyllabicCategory.txt

[jfkthame]

If I change the order to U+0A15, U+0A47, U+0A51, both BabelPad and hb-view works as expected, no dotted circle appearing.

Is it really desirable that both sequences <0A15, 0A47, 0A51> and <0A15, 0A51, 0A47> should render the same? Or would it be better to support only the sequence recommended by the Standard?