Minimal example to reproduce:

-->8--
>>> with open('f_bug.py', 'w') as fp:
...     fp.write('f"{a b}"')
... 
8
>>> import f_bug
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<fstring>", line 1
    (a b)
       ^
SyntaxError: invalid syntax
-->8--

Here we see in track trace "<fstring>" and line number in erroneous expression in f-string, but no "f_bug.py" and line number in it.