Zend certified PHP/Magento developer

Magento 2.3.2 > Some products images are broken and some are not loading correctly in frontend

I’m a new to magento and don’t know much about magento, Recently I have installed a custom theme in magento2 and then some products images became broken and some are having images with src=".../static/frontend/Mgs/claue/en_GB/MGS_Mpanel/images/blank.png"
I know about php bin/magento catalog:images:resize but my store have more than 31000 products images and this command will never complete,
what I have tried so far:

  • Upgrade: php bin/magento setup:upgrade
  • Compile: php bin/magento setup:di:compile
  • Deploy: php bin/magento setup:static-content:deploy
  • Reindexing: php bin/magento indexer:reindex
  • Cache flush and clean using: php bin/magento cache:flush & php bin/magento cache:clean
  • Flush Catalog Images Cache from Admin (backend)
  • Changed permissions:
find . -type f -exec chmod 644 {} ;

find . -type d -exec chmod 755 {} ;

chmod 644 ./app/etc/*.xml

chmod u+x bin/magento

Can you please help me with it? I have spent about one week by trying different solutions from stackexchange, stackoverflow and from other platforms but nothing work for me.
Please have a look at the frontend:

Product with /blank.png

Product with Broken image