У вашего броузера проблема в совместимости с HTML5
Learn how use Code HotSwapping in libGDX to make changes to your game while it's running.
Common pitfalls: It seems that having the android subproject breaks hotswapping. Try going to Run - Reload Changed Classes to manually reload while in debug mode.
When changing the Gradle version, it's recommended to use the latest libGDX setup from libgdx.com
Links:
OpenJDK with HotSwapAgent: https://github.com/TravaOpenJDK/trava-jdk-11-dcevm/releases
http://hotswapagent.org/
Code example: https://github.com/raeleus/HotSwapExample
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