‘Expected end of value’ warning occurs when a property declaration includes five or more variable references

Reproduction steps:
1. Open the attached “IN-113966” project
2. Select the “USSFile” in the Project window
3. Observe the Inspector window

Expected result: No warnings are shown
Actual result: One import warning is shown: warning: Expected end of value but found 'var(--transition)'

Reproducible with: 6000.0.58f1, 6000.2.6f1, 6000.3.0b3, 6000.4.0a1

Reproducible on: Ubuntu 25.04, Windows 11
Not reproducible on: No other environments tested