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For example the following f-string
f'{1):.1%}'
IDLE will scroll to the top of the file and highlight a random and irrelevant line (not sure what it's doing tbh).
running the expression with `exec` makes it look like implicit parenthesis are added to the ends of files..
>>> exec("f'{1):.1f}'")
Traceback (most recent call last):
 File "<pyshell#2860>", line 1, in <module>
 exec("f'{1):.1f}'")
 File "<fstring>", line 1
 (1))
 ^
SyntaxError: unexpected EOF while parsing
IDLE can correctly find a `(1))` in a file but appears to fail only in f-string expressions.

This is not an IDLE bug, per se. There's a known problem with f-strings not producing the correct line numbers. See issue #29051. Unless Terry thinks there's something IDLE-specific here, I suggest closing this as a duplicate.

Syntax errors come from Python, not IDLE. Except for the pseudofile name ('<pyshell*nnnn>' versus '<stdin>'), the message is the same as the interactive interpreter. Anytime one thinks IDLE has a bug, one should check the standard interactive interpreter as a 'control'.