Selecting an object that is moving with llSetRot() triggers unexpected texture rotations

Environment

Second Life Release 7.1.10.10800445603 (64bit) Release Notes

You are at 22.0, 230.9, 34.1 in Main Channel Sandbox1 located at simhost-0baaa98c62c736f81.agni SLURL: http://maps.secondlife.com/secondlife/Main%20Channel%20Sandbox1/22/231/34 (global coordinates 336662.0, 306663.0, 34.1) Second Life Server 2024-07-22.10048683488 Release Notes

CPU: Apple M1 Pro (2400 MHz) Memory: 16384 MB OS Version: macOS 14.6.1 Darwin 23.6.0 Darwin Kernel Version 23.6.0: Mon Jul 29 21:14:30 PDT 2024; root:xnu-10063.141.2~1/RELEASE_ARM64_T6000 x86_64 Graphics Card Vendor: Apple Graphics Card: Apple M1 Pro

OpenGL Version: 4.1 Metal - 88.1

Window size: 1262x690 Font Size Adjustment: 96pt UI Scaling: 0.75 Draw distance: 96m Bandwidth: 10000kbit/s LOD factor: 1.125 Render quality: 1 Texture memory: 10922MB Disk cache: Max size 1638.4 MB (100.0% used) HiDPI display mode:

J2C Decoder Version: KDU v7.10.4 Audio Driver Version: OpenAL, version 1.1 ALSOFT 1.23.1 / OpenAL Community / OpenAL Soft: OpenAL Soft Dullahan: 1.14.0.202408091638 CEF: 118.4.1+g3dd6078+chromium-118.0.5993.54 Chromium: 118.0.5993.54 LibVLC Version: 3.0.21 Voice Server Version: Not Connected Packets Lost: 3/95975 (0.0%) September 24 2024 09:34:28

Description

If an object is rotated nonphysically using llSetRot(), the viewer temporarily suppresses the movement, but incorrectly rotates some of the textures applied to the object.

Reproduction steps

Rez a box and place the script below in it
Observe that this script rotates the box by 45 degrees on the z-axis every second
Select the box, and note its appearance while selected

Expected results: As a viewer-side effect, the box should remain frozen while selected. Any other viewers present will continue to see the object moving.

Actual results: While the object is selected, the shape stops spinning (as expected), but the textures on the top and bottom faces appear to rotate by 90 degrees every 1 second or so (unexpected). Here is an illustration: https://youtu.be/pYVphnDbSn4

default
{
    state_entry()
    {
        llSetTimerEvent(1);
        llSetTexture("bca29a42-c2f3-bf92-c614-ed91654c7bf7", ALL_SIDES);
    }

    timer()
    {
        rotation newrot = llGetRot() * llEuler2Rot(<0, 0, PI_BY_TWO>);
        llSetLinkPrimitiveParamsFast(LINK_THIS, [PRIM_ROTATION, newrot]);
    }
}

secondlife / viewer