Bug: LR Classic cannot open 16 bit TIF files with deflate (ZIP) compression

Description of Issue

LR Classic fails to import TIFF files with deflate/zip compression.

Lightroom Classic Version Number (Help>System Info…) 

Lightroom Classic version: 15.3 [ 202604090947-8f3672ed ]
License: Creative Cloud
Language setting: en-NL
Operating system: Mac OS 26
Version: 26.3.1 [25D2128]
Application architecture: arm64
Logical processor count: 8
Processor speed: NA
SqLite Version: 3.36.0
Adobe GSDK Version: 1.4.0.213

OS Version Number

macos Tahoe 26.3.1 (25D2128) 

Camera Model (sometimes necessary)

n/a

Step-by-step Reproduction Instructions (in precise terms, please)

Import the following sample image in LR classic:

https://drive.google.com/file/d/14eazJOmOZ1XALHYXqae16sXBuZf9bZ_d/view?usp=sharing

The Expected Result

Image imports correctly

The Actual Result

Errors: “preview unavailable for this file” and “Could not read preview”. No image is shown.

Further details:

Hi, developer of PTGui here. PTGui now outputs TIFF images with deflate/zip compression by default. It’s fast and efficient and these can be read by virtually any application out there. Except LR Classic apparently. The attached file opens fine in Photoshop, PTGui, macOS Preview and in other applications. As far as I can see the file itself is fine.

Happy to answer any questions - support at ptgui dot com.