This thread is resolved. Here is a description of the problem and solution.
Problem: The client uses the LayerSlider plugin and on translated pages the content of the slider was missing.
Solution: WordPress debug mode revealed warnings that indicated the problem was with the W3 Total Cache plugin settings, specifically that the option to minify JS.
- Create a debug log by setting debug mode in wp-config.php - Disable the setting to minify JS in the W3 Total Cache plugin
Relevant Documentation: https://wpml.org/documentation/support/debugging-wpml/
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