syspolicyd is killing my battery on a new MacBook Pro, repeatedly scanning and re-scanning my Steam library

syspolicyd is consistently using ~20% CPU and consuming lots of power. Tracing it with sudo fs_usage "$(pgrep syspolicyd)" reveals that it's repeatedly scanning the same dozen or so Steam apps in my ~/Library/Application Support/Steam/steamapps/common directory. Is there any way to convince it to be less aggressive about scanning, or remind it that it's already scanned these locations? Or at least get it to tell me why it's doing this without resorting to dtrace tooling?