Incorrect behavior of the New Clothes Alpha when editing

Environment

Second Life Test 7.1.9.10164740217 (64bit)
Release Notes

You are at 186.2, 142.9, 21.5 in Product Engine located at simhost-0f3546ffb41c32019.agni
SLURL: http://maps.secondlife.com/secondlife/Product%20Engine/186/143/21
(global coordinates 336,826.0, 307,343.0, 21.5)
Second Life Server 2024-06-11.9458617693
Release Notes

CPU: 11th Gen Intel(R) Core(TM) i5-11260H @ 2.60GHz (2611.2 MHz)
Memory: 16111 MB
OS Version: Microsoft Windows 10 64-bit (Build 19045.4651)
Graphics Card Vendor: NVIDIA Corporation
Graphics Card: NVIDIA GeForce RTX 3050 Laptop GPU/PCIe/SSE2

Windows Graphics Driver Version: 31.0.15.2879
OpenGL Version: 4.6.0 NVIDIA 528.79

Window size: 1704x859
Font Size Adjustment: 96pt
UI Scaling: 1
Draw distance: 128m
Bandwidth: 3000kbit/s
LOD factor: 1.5
Render quality: 4
Texture memory: 4095MB
Disk cache: Max size 1638.4 MB (19.5% used)

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: 1.14.0.202310131404
CEF: 118.4.1+g3dd6078+chromium-118.0.5993.54
Chromium: 118.0.5993.54
LibVLC Version: 3.0.16
Voice Server Version: Vivox 4.10.0000.32327.5fc3fe7c.5942f08

Packets Lost: 183/52,343 (0.3%)
August 13 2024 01:47:52

Description

See Reproduction steps

Reproduction steps

1. Login to the Second Life Test 7.1.9.10164740217 viewer.
2. Select the "Outfits" button from the right panel.
3. In the "Avatar" floater select My outfits tab, then the gear menu and create New Clothes-> New Alpha.
4. In the "Editing Alpha Mask" floater check the checkbox next to the the Head Alpha picker.
5. Click the "Save" button at the top and close the "Avatar" floater.
6. Select the "Outfits" button again, select "Edit this outfit" button at the top, select and edit the "New Alpha".
7. Uncheck/check the checkbox next to the the Head Alpha picker several times and observe the unchangeable face of the avatar.

Actual result: Incorrect behavior of the New Clothes Alpha when editing

Expected result: The avatar should change correctly depending on the selected New Clothes Alpha settings

Note:
This issue is reproduced on Win10.
This issue was found during ad-hoc testing.
This issue is reproduced on the production viewer (Second Life Release 7.1.8.9375512768).
Also, this behavior was tested in Bitsy and Ashton's avatars. The avatar can remain in the world without a face, but for this, instead of 7 step -> Uncheck the checkbox next to the the Head Alpha picker, Click the "Save" button at the top, select the back arrow in the "Edit outfit parts" floater and close the "avatar" floater. This behavior happens from time to time (see actual2.mp4 videorecording).

Actual1.mp4 videorecording:

https://github.com/user-attachments/assets/bf204a2f-91ee-4b53-bd27-e94d398eef56

Actual2.mp4 videorecording:

https://github.com/user-attachments/assets/1fccabe7-8ae2-44a9-8d06-9e4b47d987d1

Start by reproducing the issue using the listed seven steps in the Outfits and Editing Alpha Mask floaters, including the intermittent no-face case described in the note. Compare the avatar's appearance while toggling Head Alpha during editing and after saving; done means the avatar changes correctly for the selected New Clothes Alpha settings.