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A general description is here.
complete.cases() failed on a 0-column data frame argument. (Underlies PR#14066.)
It could return nonsensical results if no input determined the number of cases (seen in the no-segfault tests).
qnchisq(p, df,chisq(p, df, ncp, lower.tail = FALSE) with ncp >= 80 was inaccurate for small p (as the help page said): it is now less inaccurate. (In part, PR#13999.)
For ncp, lower.tail = FALSE) with ncp >= 80 was inaccurate for small p (as the help page said): it is now less inaccurateess than but close to 80, pchisq() and qchisq() are more accurate for probablilities very close to 1 (a series expansion was truncated slightly too early).