Function llAvatarOnLinkSitTarget doesn't return avatar's key

[tannoy1000]

Steps to reproduce

Link two prims and put this script inside.
Script itself:

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default
{
state_entry()
{
llLinkSitTarget(1,<0.0,0.0,0.5>,ZERO_ROTATION);
llLinkSitTarget(2, <0.0,0.0,0.1>,ZERO_ROTATION);
}

changed(integer change)
{
    if (change & CHANGED_LINK)
    {
        if (llAvatarOnLinkSitTarget(2) != NULL_KEY)
        {
            llSay(0, "Sitting on link 2: " + (string)(llAvatarOnLinkSitTarget(2)));
        }
        // Now pay attention to the avatar on the root prim.                                
        key agent = llAvatarOnLinkSitTarget(1);
        if (agent != NULL_KEY)
        {
            llSay(0, "Sitting on link 1: " + (string)(llAvatarOnLinkSitTarget(1)));
        }
    }
}

}

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Expected behaviour

It should return avatar key id.

Actual behaviour

It returns "System.Collections.Generic.List`1[OpenMetaverse.UUID]".
Tell us what happens instead

Server configuration

Standalone.
Operating system:
Windows10 64bit
Web server:

Database:
Sqlite.
WhiteCore version:
Current master.

Logs

No errors reported in region console.

[greythane]

Thanks for the report and particularly the script to check this out.
I'll sort this one asap.

[tannoy1000]

Tnx!
This is function could be important for making some multi avatar sit scripts to work.