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HTTPS-Only Mode interferes with Automatic proxy configuration URL settings?

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I'm an old Firefox user. Thank you for excellent Browser!

However, I've seen some bad things in Firefox 89, so I'll report it. After upgrading Firefox to 89, access from behind the proxy no longer reaches all addresses beyond the firewall. I noticed that the page opens correctly when I play around with the settings, which is related to the HTTPS-Only Mode and Automatic proxy configuration URL settings. I specify the address of "http:" in the Automatic proxy configuration URL. In that case, if HTTP-Only Mode is ON, it seems that the proxy configuration file cannot be read correctly. When I turned off HTTP-Only Mode and reloaded again, the page was displayed correctly. Alternatively, I can give up the specification in the Automatic proxy configuration URL and switch to the manual specification. That said, before 89, all settings were displayed correctly, so I think it was a trigger for the change in 89. Is there anything you can think of? Is such a phenomenon happening in other people?

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