htaccess: strip .html extension if present then rewrite

Question

My htaccess is getting stuck in an infinite loop. I'm trying to strip the .html extension off a URL, if there is one, and then use the leftover string as a query string.

RewriteCond %{THE_REQUEST} ^[A-Z]{3,9}\ /.*\.html\ HTTP/
RewriteRule ^(.*)\.html$ /$1 [R=302,L]

RewriteRule ^resources/blog$ /resources/blog/ [R=302,L,QSA]
RewriteRule ^resources/blog/$ resources/blog.php [L,QSA]
RewriteRule ^resources/blog/.*?([^\.\/]*)$ resources/blog.php?pname=$1 [L,QSA]

UPDATE:

Here's how it sit at this time. I've commented some stuff out while troubleshooting.

Options +SymLinksIfOwnerMatch -MultiViews

<IfModule mod_rewrite.c>

RewriteEngine On
RewriteBase /

#Redirect to URL without .html extension (Pretty URL)
RewriteCond %{THE_REQUEST} ^[A-Z]{3,9}\ /.*\.html\ HTTP/
RewriteRule ^(.*)\.html$ /$1 [R=302]

# Pretty url for Couch CMS blog
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^resources/blog/.*?([^\.\/]*)$ resources/blog.php?pname=$1 [L,QSA,END]

RewriteRule ^resources/blog$ /resources/blog/ [R=302,L,QSA]
RewriteRule ^resources/blog/$ resources/blog.php [L,QSA]

# RewriteRule ^resources/blog/([1-2]\d{3})/(?:(0[1-9]|1[0-2])/(?:(0[1-9]|1[0-9]|2[0-9]|3[0-1])/)?)?$ resources/blog.php?d=$1$2$3 [L,QSA]
# RewriteRule ^resources/blog/[^\.]*?([^/\.]*)/$ resources/blog.php?fname=$1 [L,QSA]
# RewriteRule ^resources/blog/[^\.]*?([^/\.]*)$ "$0/" [R=302,L,QSA]

RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME}.html -f
RewriteRule ^(.+)$ $1.html [L,QSA]

</IfModule>

UPDATE 2

File structure is as follow:

/
|-- static_html_files/
|-- resources/
|----- blog.php
|----- newsletter.html
|-- .htaccess
|-- index.html

Most files are static and their URL's need to be 'prettified' by stripping the .html extension from them and then redirected to with the pretty URL.

The blog.php has to be prettified as well and the Couch CMS generated links need to be rewritten. The rule for rewriting the couch cms links is the one that keeps looping.

UPDATE 3

It seems there is a 301 redirect somewhere but I don't have a 301 in my htaccess? Not sure where to go from here or where to look for this redirect. See Redirect Check results below:

https://xxxxx.ca/resources/blog/yyyyy

HTTP/1.1 301 Moved Permanently
Date: Tue, 25 Jun 2019 20:58:31 GMT
Server: Apache
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate
Pragma: no-cache
Set-Cookie: PHPSESSID=poplcjkqcgd4gk57c1l3lcdjg7; path=/
Location: https://xxxxx.ca/resources/blog/yyyyy.html
Transfer-Encoding: chunked
Content-Type: text/html; charset=UTF-8

https://xxxxx.ca/resources/blog/yyyyy.html

HTTP/1.1 302 Found
Date: Tue, 25 Jun 2019 20:58:31 GMT
Server: Apache
Location: https://xxxxx.ca/resources/blog/yyyyy
Content-Length: 263
Content-Type: text/html; charset=iso-8859-1

[RINSE & REPEAT AD NAUSEAM]

UPDATE 4

After some debugging, I seem to be having an Apache problem with mod_rewrite and 'add path info postfix' which is generally solved by specifying -MultiViews and/or adding the DPI flag to the rules but neither of these seem to solve any of my problems.