Why can't I import a package that imports another package?

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Python

I don't know how to phrase this question, but this is my main script:

master.py:

from terminal_module.output import Terminal as term

vterm = term()

This is the terminal output module (in relative directory /terminal_module/output.py:

from voice_synthesis.tts import TTS

class Terminal:
    print("INIT")
    synth = TTS()
    print("INIT FINISHED")

This is the TTS module (in relative directory from master.py /terminal_module/voice_synthesis/tts.py:

import pyttsx3

class TTS:
    engine = None
    def __init__(self):
        self.engine = pyttsx3.init()
    def speak(self, text):
        self.engine.say(text)

And if I run:

tts.py = Works as it exists almost immediately with no error
output.py = Works as it outputs INIT and then INIT FINISHED and exits with no error
master.py = Fails with the following error:

Traceback (most recent call last):
  File "e:\0000_AI\GEN_1\ANNA\src\master.py", line 9, in <module>
    from voice_terminal_module.voice_terminal import VoiceTerminal as VoiceTerminalModule
  File "e:\0000_AI\GEN_1\ANNA\src\voice_terminal_module\voice_terminal.py", line 2, in <module>
    from voice_synthesis_module_TEMP.tts import TTS
ModuleNotFoundError: No module named 'voice_synthesis_module_TEMP'

Why is this? I could probably implement the TTS class functionality into Terminal, but this project will be pretty big, so I would like to have as many classes as possible. Hope this makes sense, thanks!

What I have tried:

I have tried running each script independently and it all worked.