/Library / Preferences / com.apple.networkd.plist If enable_unified_http is true, streaming video does not work. Does anyone know this? Why isn't anyone answering?

I have a question. In the file located at /Library/Preferences/com.apple.networkd.plist, if the dict entry for enable_unified_http is set to true or if the value is missing, there is an issue where the video player does not run on MacOS Sequoia Safari 18.0. I found that setting it to false allows it to function properly. Could you explain what this setting does and whether it is possible to change this setting to false within the app?