Well, after the latest update (v1.45.15341), the error message described above no longer appears.
As I mentioned before, I use the CodeIgniter 4 framework in its most current version and now the issue is the following:
I have a file that is located in the views directory and that uses a CodeIgniter function called array_deep_search(). This function is declared within a file called array_helper.php located in the path ~/Mslb/vendor/codeigniter4/framework/system/Helpers/array_helper.php, with Mslb being the workspace directory and vendor being the internal Codeigniter system directory.
This function can be used in a view by calling the global helper(?) function of Codeigniter in the controller that calls the view in question, passing as a parameter the name of the file that contains the required function, in this case: "array".
Well, here comes the strange thing. If I have the array_helper.php file (red circle) open, which is where the array_deep_search() function is declared, the error does not appear in the contact.php file that corresponds to the view file.

But if I do not have the array_helper.php file open, the error does appear in the contact.php file.

Interesting, right?
Why could this be happening?
Thank you