Unpredictable unicode special characters in text on copy/paste
1) Create any kind of text area by selecting Toolbar -> Add -> Text -> (any option).
2) Open up the Special Characters panel and insert several characters under Mathematical Alphanumeric Symbols section.
3) Copy the special characters and paste into the same box. Musescore shows Hangul characters instead (For instance, 𝕗 U+1D557 turns into 핗 U+D557 predictably).
4) Backspace one of the special characters then undo (ctrl+z). The character transforms into anything between �, 🀀, and the default tofu block.