How to reproduce:
1. Open the “IN-112483_AddressablePackSeparate“ project
2. Open the “Sc_Menu“ Scene
3. Go to Window > Asset Management > Addressables > Groups
4. Set “Play Mode Script” to “Use Existing Build”
5. Select Build > New Build > Default Build Script
6. Enter Play Mode
7. In Game view observe the icon for the “Spanish” option

Expected result: The icon is a Spanish flag
Actual result: The icon is not a Spanish flag

Reproducible with: 2.5.0 (6000.0.40f1), 2.7.2 (6000.0.55f1, 6000.2.4f1, 6000.3.0a4)
Not reproducible with: 2.4.6 (6000.0.40f1)
Could not test with: 6000.3.0a5, 6000.3.0b1 (Compilation errors due to Base2DMaterialUpgrader.cs)

Reproducible on: macOS 15.6.1 (M1 Max), Windows 11 (by user)
Not reproducible on: no other environments tested

Note: Changing Bundle Mode in Disciplines Group to “Pack Together” bypasses the issue