Any errors in the console log?

Also Select Target in com_associations side by side is now broken: modal displays but clicking on a content item (tested for articles and categories has no effect.

some of the errors
"TypeError: window.processModalParent is not a function"

TypeError: window.processModalEdit is not a function

Error: Tooltip is transitioning

for com_asssociations, I have
TypeError: o is undefined[Learn More] admin-associations-modal.min.js:1:53
TypeError: document.getElementsByName(...)[0] is undefined[Learn More] multiselect.min.js:1:756

ok thanks, will take a look

@C-Lodder
Concerning com_associations side by side I can get rid of the error in admin-associations-modal.js by this code (for the uncompressed files)

diff --git a/media/com_associations/js/admin-associations-modal.js b/media/com_associations/js/admin-associations-modal.js
index b3cae69..48bb490 100644
--- a/media/com_associations/js/admin-associations-modal.js
+++ b/media/com_associations/js/admin-associations-modal.js
@@ -25,3 +25,3 @@
 		}
 	});
-})();
+}( Joomla, document ));
diff --git a/media/com_associations/js/modal-associations.js b/media/com_associations/js/modal-associations.js
index 01bccb3..4de5d2b 100644
--- a/media/com_associations/js/modal-associations.js
+++ b/media/com_associations/js/modal-associations.js
@@ -23,3 +23,3 @@
 	});
 
-})();
+}( Joomla, document ));

but not the error in multiselect

I cannot replicate the issue entirely. The only errors I get are:

TypeError: document.getElementsByName(...)[0] is undefined ------- multiselect.min.js:1:753
TypeError: d is null ------- draggable.min.js:1:122

I do not see this:

TypeError: o is undefined[Learn More] admin-associations-modal.min.js:1:53

I cannot replicate this. Assuming it has been fixed elsewhere. I am closing it for now. It can always be re-opened

That one has indeed been solved since...
but not this one: #15439