Real Thumbnail Generator: Efficiently force regenerate thumbnails in bulk...

## 2.6.139 (2026-05-07)
### Bug Fixes
* declare GPL license in plugin headers (CU-869d454p5)
* uncaught TypeError: substr(): Argument [#1](https://git.owlinfra.de/devowlio/devowl-wp/issues/1) () must be of type string, array given (CU-869cx9ua6)

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