D6000 1 of 4 external display setup not connected in clamshell mode

[r24]

I’m experiencing an issue using DisplayLink with macOS Sequoia 15.5 on a MacBook Pro (M1 Pro). Everything worked perfectly until recently.

Setup:
• DisplayLink Manager: 1.12.4 (Build 90)
• macOS: Sequoia 15.5
• MacBook Pro M1 Pro – 16-core GPU
• Displays:
• LG HDR 4K (6016×3384)
• LG ULTRAGEAR+ 4K (3840×2160 @ 120Hz)
• Samsung S34CG50 Ultrawide (1440×3440 @ 100Hz) – via DisplayLink
• LG Ultrawide (1440×3440 @ 50Hz) – via DisplayLink
• Built-in Liquid Retina XDR (3456×2234)

Issue:

When the MacBook lid is open, all 5 displays (including the 2 DisplayLink-powered ultrawides) work perfectly.

However, when I close the lid to enter clamshell mode:
• The two DisplayLink displays disappear
• Only three monitors remain active

This began recently. I’ve confirmed that:
• All permissions (Screen Recording, Accessibility) are enabled
• The DisplayLink Manager app is running
• All monitors are initialized before closing the lid
• I’ve tried toggling the “Power save all displays and sleep in clamshell” setting with no change

Is this a known issue with clamshell handling in version 1.12.4 or macOS Sequoia?
Are there any recommended workarounds or diagnostic logs I can provide to help resolve this?
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Apple M1 Pro:

Chipset Model: Apple M1 Pro
Type: GPU
Bus: Built-In
Total Number of Cores: 16
Vendor: Apple (0x106b)
Metal Support: Metal 3
Displays:
Color LCD:
Display Type: Built-in Liquid Retina XDR Display
Resolution: 3456 x 2234 Retina
Main Display: Yes
Mirror: Off
Online: Yes
Automatically Adjust Brightness: No
Connection Type: Internal
LG ULTRAGEAR+:
Resolution: 3840 x 2160 (2160p/4K UHD 1 - Ultra High Definition)
UI Looks like: 3840 x 2160 @ 120.00Hz
Mirror: Off
Online: Yes
Rotation: Supported
Television: Yes
LG ULTRAWIDE:
Resolution: 1440 x 3440
UI Looks like: 1440 x 3440 @ 50.00Hz
Mirror: Off
Online: Yes
Rotation: 90
S34CG50:
Resolution: 1440 x 3440
UI Looks like: 1440 x 3440 @ 100.00Hz
Mirror: Off
Online: Yes
Rotation: 270
LG HDR 4K:
Resolution: 6016 x 3384
UI Looks like: 3008 x 1692 @ 60.00Hz
Mirror: Off
Online: Yes
Rotation: Supported


***Issue*** Apple M1 Pro (Clamshell Mode):

Chipset Model: Apple M1 Pro
Type: GPU
Bus: Built-In
Total Number of Cores: 16
Vendor: Apple (0x106b)
Metal Support: Metal 3
Displays:
LG HDR 4K:
Resolution: 6016 x 3384
UI Looks like: 3008 x 1692 @ 60.00Hz
Main Display: Yes
Mirror: Off
Online: Yes
Rotation: Supported
LG ULTRAGEAR+:
Resolution: 3840 x 2160 (2160p/4K UHD 1 - Ultra High Definition)
UI Looks like: 3840 x 2160 @ 120.00Hz
Mirror: Off
Online: Yes
Rotation: Supported
Television: Yes
S34CG50:
Resolution: 1440 x 3440
UI Looks like: 1440 x 3440 @ 100.00Hz
Mirror: Off
Online: Yes
Rotation: 270