Same as eb32507cb, for two `t:*` counts it missed. They only differ once
a design can still be in signorm mode when the assertion runs; the
subtraction is a no-op otherwise.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MQU5XCqDYY8MbivGkNRrDo