Bug: getting "DecodingException: Unable to decode KnownChildSensitiveDataConsents"

[AndroidDeveloperLB]

I use this library to detect if data-sharing is enabled, by using this:

implementation("com.iabgpp:iabgpp-encoder:3.2.3")

    /** @return returns null if not initialized yet, or initialized and it's ok to share data.
     * When returned true, it means all kinds of data sharing is allowed:SALE_OPT_OUT, SHARING_OPT_OUT, TARGETED_ADVERTISING_OPT_OUT.
     * Otherwise returns false*/
    fun isDataShareAllowed(context: Context): Boolean? {
        val defaultSharedPreferences = PreferenceUtil.getDefaultSharedPreferences(context)
        val gppString = defaultSharedPreferences.getString("IABGPP_HDR_GppString", null) ?: return null
        when(gppString){
            "DBABL~BVQqAAAAAg" -> return true
            "DBABL~BVQVAAAAAg" -> return false
        }
        CrashlyticsUtil.logException("AdConsentUtil isDataShareAllowed unknown gppString detected:$gppString, so using fallback")
        val model = GppModel(gppString)
        val usNatSection1 = model.getSection(UsNat.ID)
        val fieldsToCheck = arrayOf(UsNatField.SALE_OPT_OUT, UsNatField.SHARING_OPT_OUT, UsNatField.TARGETED_ADVERTISING_OPT_OUT)
        for (fieldName in fieldsToCheck) {
            if (usNatSection1.hasField(fieldName)) {
                val fieldValue = usNatSection1.getFieldValue(fieldName) ?: continue
                if (fieldValue == 2)
                    continue
                return false
            }
        }
        return true
    }

Recently I got a crash of this sort, reported via Crashlytics, on the line of "getFieldValue":

...
          Caused by com.iab.gpp.encoder.error.DecodingException: Unable to decode KnownChildSensitiveDataConsents
       at com.iab.gpp.encoder.bitstring.BitStringEncoder.decode(BitStringEncoder.java:49)
       at com.iab.gpp.encoder.segment.UsNatCoreSegment.decodeSegment(UsNatCoreSegment.java:107)
       at com.iab.gpp.encoder.segment.UsNatCoreSegment.decodeSegment(UsNatCoreSegment.java:16)
       at com.iab.gpp.encoder.segment.AbstractLazilyEncodableSegment.getFieldValue(AbstractLazilyEncodableSegment.java:31)
       at com.iab.gpp.encoder.section.AbstractLazilyEncodableSection.getFieldValue(AbstractLazilyEncodableSection.java:51)

          Caused by com.iab.gpp.encoder.datatype.SubstringException: java.lang.StringIndexOutOfBoundsException: begin 56, end 62, length 60
       at com.iab.gpp.encoder.datatype.EncodableFixedIntegerList.substring(EncodableFixedIntegerList.java:54)
       at com.iab.gpp.encoder.bitstring.BitStringEncoder.decode(BitStringEncoder.java:44)
       at com.iab.gpp.encoder.segment.UsNatCoreSegment.decodeSegment(UsNatCoreSegment.java:107)
       at com.iab.gpp.encoder.segment.UsNatCoreSegment.decodeSegment(UsNatCoreSegment.java:16)
       at com.iab.gpp.encoder.segment.AbstractLazilyEncodableSegment.getFieldValue(AbstractLazilyEncodableSegment.java:31)
       at com.iab.gpp.encoder.section.AbstractLazilyEncodableSection.getFieldValue(AbstractLazilyEncodableSection.java:51)

          Caused by java.lang.StringIndexOutOfBoundsException: begin 56, end 62, length 60
       at java.lang.String.checkBoundsBeginEnd(String.java:4519)
       at java.lang.String.substring(String.java:2537)
       at com.iab.gpp.encoder.datatype.EncodableFixedIntegerList.substring(EncodableFixedIntegerList.java:52)
       at com.iab.gpp.encoder.bitstring.BitStringEncoder.decode(BitStringEncoder.java:44)
       at com.iab.gpp.encoder.segment.UsNatCoreSegment.decodeSegment(UsNatCoreSegment.java:107)
       at com.iab.gpp.encoder.segment.UsNatCoreSegment.decodeSegment(UsNatCoreSegment.java:16)
       at com.iab.gpp.encoder.segment.AbstractLazilyEncodableSegment.getFieldValue(AbstractLazilyEncodableSegment.java:31)
       at com.iab.gpp.encoder.section.AbstractLazilyEncodableSection.getFieldValue(AbstractLazilyEncodableSection.java:51)

Why does it occur?

[lamrowena]

@chuff did we ever confirm if the PR referenced above addresses this?