SUMMARY

I've been trying to determine why I see phone numbers instead of contact names. I've done all the recommended stuff (e.g. kpeople-vcard, granting phone permissions), so I looked at the KDE Connection logs from my phone and noticed an exception around creation of vcards:

Exception in ContactsPlugin's onPacketReceived()
java.lang.StringIndexOutOfBoundsException: String index out of range: -1
	at java.lang.String.substring(String.java:2064)
	at org.kde.kdeconnect.Helpers.ContactsHelper$VCardBuilder.<init>(ContactsHelper.java:309)
	at org.kde.kdeconnect.Helpers.ContactsHelper.getVCardsSlow(ContactsHelper.java:158)
	at org.kde.kdeconnect.Helpers.ContactsHelper.getVCardsForContactIDs(ContactsHelper.java:176)
	at org.kde.kdeconnect.Plugins.ContactsPlugin.ContactsPlugin.handleRequestVCardsByUIDs(ContactsPlugin.java:216)
	at org.kde.kdeconnect.Plugins.ContactsPlugin.ContactsPlugin.onPacketReceived(ContactsPlugin.java:255)
	at org.kde.kdeconnect.Device.notifyPluginPacketReceived(Device.kt:433)
	at org.kde.kdeconnect.Device.onPacketReceived(Device.kt:422)
	at org.kde.kdeconnect.Backends.BaseLink.packetReceived(BaseLink.java:60)
	at org.kde.kdeconnect.Backends.LanBackend.LanLink.receivedNetworkPacket(LanLink.java:256)
	at org.kde.kdeconnect.Backends.LanBackend.LanLink.$r8$lambda$1roQrklD197DaNpVzAP29DenyWc(LanLink.java:90)
	at org.kde.kdeconnect.Backends.LanBackend.LanLink$$ExternalSyntheticLambda1.run(R8$$SyntheticClass:0)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
	at java.lang.Thread.run(Thread.java:920)

I didn't bring it up in a debugger, so I'm not sure whether the vcard string passed into the constructor was empty (my guess), or simply didn't contain an "END:VCARD":

        VCardBuilder(String vcard) {
            // Remove the end tag. We will add it back on in .toString()
            vcard = vcard.substring(0, vcard.indexOf(VCARD_END));

            vcardBody = new StringBuilder(vcard);
        }

NOTE: The try/catch is located INSIDE the loop, suggesting that some outlier among my contacts would only affect that contact and not the entire list. Thus I suspect that there is some earlier issue preventing the contact information from reaching this point...

STEPS TO REPRODUCE

    1. After connecting my Galaxy Note 10+ phone (LAN/Wi-Fi), I open KDE Connect SMS. I see a list of conversations, but phone numbers and the generic contact icon are displayed for each rather than contact information and avatar images.

OBSERVED RESULT

    Conversations appear in a list, but phone numbers are displayed instead of contact information.

EXPECTED RESULT

    Contact avatar images and names should be displayed for each item in the list.

SOFTWARE/OS VERSIONS
    Linux/KDE Plasma: Debian GNU/Linux 14 (Trixie)
    KDE Plasma Version: 6.3.6
    KDE Frameworks Version: 6.13.0
    Qt Version: 6.8.2

ADDITIONAL INFORMATION