Thanks for all this. It’s great information that could save me a lot of trouble in the future.Whoa! I'll check Finder to see if it works for me now or not. (I haven't used Finder for the last few years because of this issue.)
Well ... it's now even worse in my humble opinion because Finder is now inconsistent, let me explain.
I created a new directory named "Testing" and in this directory I created a new file named "._test-finder.txt".
If I use Finder to Copy-n-Paste the "Testing" directory to a new location, then the directory is copied but the copied directory does NOT contain the file named "._test-finder.txt". On the other hand, if I Drag-n-Drop the original "Testing" directory to a new location, then in the new location the "Testing" directory still does contain the "._test-finder.txt" file.
In summary, as of today under macOS 14.3.1 the Finder's Copy-n-Paste misses "._*" files while the Finder's Drag-n-Drop does not miss these files.
I still have the results of all of the tests that I performed a few years back, and when I checked these old results, both of the above tests failed to copy/transfer "._*" files, so it appears that Apple has fixed one problem but not the other problem --- thus the results using Finder are now inconsistent. It was bad enough that Apple's Finder missed these "._*" files before, now Finder is inconsistent in its behavior --- sometimes missing "._*" files and sometimes not. Makes me worry about how other utilities might be altered.
I'll have to repeat all of my earlier tests of all of the ways to view/copy/transfer files.
Again, as of today, both the Homebrew "gtar" and "rsync" do NOT miss files when copying/transferring. I thus recommend that one employ these utilities for now to copy/transfer directories/files and we'll see how Apple alters the behaviors of their other utilities in the future (of course, only if you use Windows files or certain databases that employ "._*" filenames).
Thanks,
Solouki