COG Driver does not preserve extra samples tag

[lukas-juschka-pix4d]

What is the bug?

Generating a COG using GDAL translate does not preserve the "extra samples" TIFF tag, which indicates whether the alpha channel is pre-multiplied. Instead, it always writes "Unassociated alpha data".
Alternatively, the COG driver could offer an "ALPHA" creation option, as the GTiff driver does: https://gdal.org/en/latest/drivers/raster/gtiff.html

Steps to reproduce the issue

• Extract the tiff from input.zip attached below
• Run gdal_translate input.tiff translated.tiff -of COG -co NUM_THREADS=ALL_CPUS -co COMPRESS=LZW
• Run tiffinfo translated.tiff to verify the Extra samples tag.

Expected behaviour: The "Extra samples" tag matches the tags in the input tiff.
Actual behaviour: The "Extra samples" tag is always "Unassociated alpha data".
input.zip

Versions and provenance

Operating system: Linux Ubuntu 22.04
GDAL version: GDAL 3.10.0, released 2024/08/13
Binary source: Conda

Additional context

No response