Hello,
I have same issue with black screen on TV with file title. Here's the debug log from Windows 10 Pro 64 bit.
VLC Debug: https://pastebin.com/AvvM1qvr
Windows 10 Pro, VLC 3.0.19
Chromecast 4K, external
Firewall settings: VLC media player "Private" is checked.
movie type: mkv
There was an error of "Casting requires conversion and can drain battery." (I pressed Yes).
Thank you!