object cache implementation does not support flushing in-memory runtime cache

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Since 2.2.9, I get this notice in log once per minute:

“PHP Notice: Function wp_cache_flush_runtime was called incorrectly. Your object cache implementation does not support flushing the in-memory runtime cache. Please see Debugging in WordPress for more information. (This message was added in version 6.1.0.) in /public_html/wp-includes/functions.php on line 5835”

PHP 8.0, current WP, current W3 Total Cache

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