If bringing MicroPython into paste mode and disconnecting then, initial prompt on next WebREPL connect is wrong. The prompt is ">>> " although MicroPython is in paste mode as can be seen in screenshot. Initial prompt on connect is wrong as well if the module gets into raw mode (eg. by screen session). Initial prompt on WebREPL connect then is ">>> " as well.

Since MicroPython should know its mode on connect, it should present the correct initial prompt: