German umlauts / French accented characters break serial output

Describe the bug
Using German umlauts (üäöÜÄÖ) or French accented characters (éèàÉÈÀ) breaks serial output from the microbit to the linked (webusb) makecode editor window. (The same output from the simulator however works fine).

Writing/sending a string of text (serial.write_line) containing such characters does not produce the expected output in the web console of the browser.

To Reproduce
Create a program that outputs the aforementioned characters.

serial.write_line("-- start") serial.write_line("Word (no umlauts)") serial.write_line("Wörd (German umlaut") serial.write_line("Wérd (French accent)") serial.write_line("end -- ")

Expected behavior
The console output in the makecode editor window should output the characters as stated in the code.
Alternatively, the umlaut/accented characters should be substituted with an icon showing that the character cannot be shown (a question mark or a square, for instance).

Screenshots
The code:

The result (from real micro:bit)

micro:bit version (please complete the following information):
V2 (no others available to test)

Desktop (please complete the following information):

• OS: MacOS 12.0.1
• Browser : Chrome
• Version: 97.0.4692.99

Smartphone (please complete the following information):

Additional context
serial.writeValue("Wörd", 0) is also affected: Using serial.writeValue with a string containing umlauts will not output/graph the value in the makecode editor browser window.

Start by reproducing the issue with serial.write_line and serial.writeValue using the accented strings, comparing real micro:bit output with the simulator and the MakeCode browser console. Done means the console preserves those characters, or consistently displays a clear replacement when they cannot be shown.