Answer
This has been tied to changes introduced in more recent Chromium browser versions (reported around version 131) affecting BPA/Workflow Designer rendering specifically — check current community/release notes for the latest guidance and workaround for your specific browser version, since this is a browser-compatibility issue tracked as its own topic rather than an environment-specific configuration problem, which is also why it can affect some machines/users and not others depending on their exact browser version and update timing.