fd3f475b3f
This bug was introduced in 295dbd8e1e when replacing
```diff
-for (ChannelList::iterator chan = c->begin (); chan != c->end (); ++chan, ++n) {
+for (auto const& chan : *c) {
```
see also https://discourse.ardour.org/t/first-10-seconds-of-modified-stereo-region-goes-mono-output/109322
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