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Mathtools' showonlyrefs fails with subequations
For the code
\begin{subequations}\label{eq:sub}
\begin{gather}
\frac{\text{d}b_1}{\text{d}z} - \im\beta_1b_1 = C_{12}b_2,\\
\frac{\text{d}b_2}{\text{d}z} - \im\beta_2b_2 = C_{21}b_1.
...
