This issue seems to be happening in various text input situations - here's an example (change material name). Perhaps it's to do with Windows and/ or Twinmotion dark mode, but I've not tested alternatives. Is this a problem with other users?
Thank you for posting in the community about the text not being visible and we are working on improving the UI and I we have addressed this problem. If you have additional feedback or ideas to suggest please submit them on our road-map here: https://portal.productboard.com/7pu88c9kpmqtzt8hwg6arujh/tabs/5-in-progress