I have found the culprit in the end. It was the function
org-html--unlabel-latex-environment, int he ox-html.el file.

I'm not sure this function is useful as I think it is better to give the
user control on his environment (labelled or unlabelled) directly in his
org file. I'm I missing something else about the use of this function?

Anyway it was a good experience at debugging elisp.

diff --git a/lisp/ox-html.el b/lisp/ox-html.el
index 55d017529..b2a5d6d36 100644
--- a/lisp/ox-html.el
+++ b/lisp/ox-html.el
@@ -2891,7 +2891,7 @@ CONTENTS is nil.  INFO is a plist holding contextual 
      ((assq processing-type org-preview-latex-process-alist)
       (let ((formula-link
-              (org-html--unlabel-latex-environment latex-frag)
+              latex-frag
               processing-type info)))
         (when (and formula-link (string-match "file:\\([^]]*\\)" formula-link))
           (let ((source (org-export-file-uri (match-string 1 formula-link))))

Best regards,

- GNU Emacs 28.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.5, cairo 
version 1.16.0) of 2020-09-01
- Org mode version 9.3.7 (release_9.3.7-725-g7bc18e @ 

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