German Universal UHD "How to Train Your Dragon (2025)" not detected by BU40N (Firmware 1.00)

[DarkTerminator]

Hello everyone,

I'm having a strange issue with the German 4K UHD Steelbook release of How to Train Your Dragon (2025) from Universal.

Drive:

HL-DT-ST BD-RE BU40N
Firmware: 1.00 (Original, unpatched)
LibreDrive: Enabled
MakeMKV: 1.18.4

Problem:
The UHD disc is not detected at all.

Windows Explorer does not recognize that a disc is inserted.
MakeMKV reports "No disc inserted".
The drive information shows "No disc inserted".

However:

The included Blu-ray from the same Steelbook is detected immediately and can be opened normally in MakeMKV.
Other UHD discs (for example The Lord of the Rings) are detected and ripped without any problems.
The same UHD disc plays perfectly in my standalone 4K UHD Blu-ray player connected to my TV.

So the issue only occurs with this specific UHD disc in my BU40N.

Has anyone experienced the same problem with this release?

Is this a known compatibility issue with this particular Universal pressing, or could it indicate a problem with my drive?

Any help would be greatly appreciated.

Thank you!