Launcher using excessive system resources on macOS Catalina

After updating to macOS Catalina, Minecraft Launcher is using excessive system resources. MacBook fan kicks on high shortly after Minecraft launches, Activity Monitor shows launcher using 99% CPU at minimum. Game is playable but fan noise is excessive and continuous. Force-quitting the Minecraft Launcher resolves issue, and I can play normally after quitting the launcher (is it SUPPOSED to stay open after launching Minecraft?) This behavior was not observed at any time prior to OS upgrade.