OK, if it is confirmed that Bitwarden no longer interferes with your site after making the modifications suggested above, then we can now try to get back some of the functionality that you could like to use (hopefully without messing up your web server).
Which of the following features do you consider essential?
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Do you absolutely need to use “Auto-Fill on Page Load”? It is more secure to only trigger auto-filling on demand.
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Do you absolutely need inline auto-fill menu (inside input fields)? This is a brand new feature. The original auto-fill methods can still be used (e.g., the keyboard shortcut Ctrl+Shift+L is very convenient, and does not interfere with the webpage HTML).
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Do you absolutely need Bitwarden to prompt you to save passwords? It is actually more efficient to set up new account in the Bitwarden browser extension first, and subsequently transfer the information to the web form.
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Do you absolutely need to store passkeys in Bitwarden?
Depending on your answers to the above, I’ll try to come up with a configuration that may work for you.