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The function wp_cache_get_multiple was added in WordPress 5.5. However this plugin does not seem to support it. Adding support is simple, as you already have wp_cache_get_multi. Please implement this function.
Introduce wp_cache_get_multiple() in WordPress Core
See where I did this in WordPress core.
https://github.com/WordPress/wordpress-develop/commit/ab0feb8b44eca9648f00c74f7932b794307f9ce2