Problem with components initialization on V7.2.0 and UMD for

Expected behavior

components should initialize

Actual behavior

after migration from v6 to v7 in UMD format, components don't initialize although I added the data-mdb-{component-name}-init property.

For example, using toats, I get an error in the browser console : TypeError: can't access property "show", basicInstanceSuccess is null (see the code in the sandbox link below)

In my site, if I replace mdb.Toast.getInstance(eljToastSuccess) by mdb.Toast.getOrCreateInstance(eljToastSuccess), it works OK. That means the toast component hasn't been initialized, but I don't know why. I have the same error for all compnents that need to be initialized.

Resources (screenshots, code snippets etc.)

When I copy my code to the MDB sansbox, it works https://mdbootstrap.com/snippets/standard/efilippi/6024386

When the code is in my site, it doesn't work, although I included :

<!-- MDB ESSENTIAL -->
  <script type="text/javascript" src="assets/templates/ELJ_4/js/mdb.umd.min.js"></script>
  <!-- MDB PLUGINS -->
  <script type="text/javascript" src="assets/templates/ELJ_4/plugins/js/all.min.js"></script>

at the end of the page body.

See a page source example : https://www.dropbox.com/scl/fi/iisyqy58wkcorc9gjx7up/code_toast.html?rlkey=dq9juo1mh2pvc9ldmzbg7n2mn&dl=0

Can you help me to find what I've done wrong ?

Thank you. Eric