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[users@httpd] acme-challenge folder exists but 404 contents

I have an apache install that has been up and running for months.  I use LetEncrypt for certificates.  I went to renew all of my certificates using an automated script that worked fine 3 months ago on the last refresh.  It failed on every domain saying the challenge file was not found.  I put a test.html file in /.well-known/acme-challenge folder, and tried to access it with a browser, and it gave me a 404.  After moving the test.html file around into other folders, it was found correctly in every folder except acme-challenge.  I even renamed acme-challenge to acme-challenge1 and acme1challenge, and test.html was found in folders by those names.  Renamed it back to acme-challenge and I'm again getting 404.  I have about 15 virtual hosts defined.  Exact same situation in every virtual host  The folder specifically named "acme-challenge" is somehow now being blocked or hidden by apache.

I'm using WAMP 3.1.3 (Apache 2.4.33).  The only .htaccess file in the entire wamp tree is in the php folder, and I'm not using php.  I'd say I haven't made any changes that would cause this problem since the last time I refreshed certificates.  But I guess I did 'something'.  But I'm clueless.

One thing I did notice.... In the browser, if I look for a non-existent file in any other folder, I get one 404 line saying the requested file was not found on the server.  Fine.  But when I look for that same non-existent file in the /.well-known/acme-challenge folder, I get that same line.  But I also get another line I haven't seen before that says:

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

So not only can't find the file, it can't find a file to tell me it can't find the file... (???).  But this line ONLY appears when trying to get a file from that one specific directory named 'acme-challenge'.

Help.... certs have expired....