Conditional Logic broken

As explained in the support ticket #1619769049, conditional logic has broken either in a WP upgrade between 5.5.5 and 5.8 or an ACF upgrade between 5.9.6 and 5.9.9.

The HasValue condition does no longer work on multi-select user field. The work-around using a LessThan rule does not work on cloned fields.

The reason for the first error is, that an empty Array is considered to be a non-empty value.
The reason for the second error is that isLessThan() consideres null to be not-less-than-one

Both can be fixed with the following patch:

Index: assets/build/js/acf-input.js
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
diff --git a/assets/build/js/acf-input.js b/assets/build/js/acf-input.js
--- a/assets/build/js/acf-input.js	(revision 8fd2564c86de244ca0b88c7773e0a861d7044cc5)
+++ b/assets/build/js/acf-input.js	(date 1630616522694)
@@ -5289,7 +5289,11 @@
 		label: __('Has any value'),
 		fieldTypes: [ 'text', 'textarea', 'number', 'range', 'email', 'url', 'password', 'image', 'file', 'wysiwyg', 'oembed', 'select', 'checkbox', 'radio', 'button_group', 'link', 'post_object', 'page_link', 'relationship', 'taxonomy', 'user', 'google_map', 'date_picker', 'date_time_picker', 'time_picker', 'color_picker' ],
 		match: function( rule, field ){
-			return (field.val() ? true : false);
+			var val = field.val();
+			if( val instanceof Array ) {
+				val = val.length;
+			}
+			return (val ? true : false);
 		},
 		choices: function( fieldObject ){
 			return '<input type="text" disabled="" />';
@@ -5625,6 +5629,9 @@
 			if( val instanceof Array ) {
 				val = val.length;
 			}
+			if( val === undefined || val === null || val === false ) {
+				return true;
+			}
 			return isLessThan( val, rule.value );
 		},
 		choices: function( fieldObject ){

Start in assets/build/js/acf-input.js at the HasValue and LessThan conditional logic handlers. Reproduce the reported cases with a multi-select user field and a cloned field, then verify that empty arrays and null, undefined, or false values are handled as described. Done means both conditional logic cases work without the reported workarounds.