Yes, that is problematic. This explains it:
sage: df = diff(function('f')(x), x); df
diff(f(x), x)
sage: repr(df)
'diff(f(x), x)'
sage: df1 = SR(repr(df)); df1
so the second result is what you get from
function('diff')(f(x),x)
I suspect the only reason why df1 behaves a bit like df is because of name
clashes (in maxima for instance)
Clearly, SR('diff(...)') operates in a scope where "diff" isn't bound to
the toplevel "diff".
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