Since recently, felt test <file> has not been using the updated file.

I'm adding a new test to keyboard_converter_test.dart, which had 19 tests before the change. But after adding the new test, it still reports 19 tests (log).
(it doesn't matter if I add --no-wasm or not)

Strangely, the reported compiling output build/html_tests/test/keyboard_converter_test.dart.browser_test.dart.js contains the correct new test.

After discussing with @eyebrowsoffire , removing the //flutter/lib/web_ui/build directory solves this issue.