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Recently this PR was merged into master to add NaN checks for the integrator
#12217
In the PR, the comments for IsUpdateZero() state that it will return false if NaNs are detected; however, there is a logical mistake in the implementation, where if all xc[i] are NaN and dxc[i] are normal, it will return true. This change adds a NaN check for xc[i]s so that the code behaves as expected.
The original issue was #12201
This change is