Thanks for trying it out! Yes, language support is still being actively worked on, and unfortunately the syntax highlighting isn't quite to parity (yet). If you are able to log an issue with the specific case you are seeing, that would be very helpful.
It's definitely a goal of the project to be on-par with other IDEs in terms of language support, but unfortunately we aren't there yet.
VSCode is maybe slower and less configurable, but it is years ahead in terms of language support at least for tsx.