The v3.13.1 release is a patch release that addresses a few regressions in the v3.13.0 release. See the [v3.13.0 release notes](https://github.com/openlayers/openlayers/releases/tag/v3.13.0) for details on upgrading from v3.12.
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## Fixes
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* [#4736](https://github.com/openlayers/openlayers/pull/4736) - Properly detect feature on unmanaged layer for toggle selection ([@ahocevar](https://github.com/ahocevar))