Newest upgrade to Brave 1.48.171 blocks all access to localhost (127.0.0.1 FE80::1) err 403 access denied

[avei]

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Description of the issue:
With the current upgrade of Brave to version :
Version 1.48.171 Chromium: 110.0.5481.177 (Official Build) (arm64)

I am no longer able to access the following address which is local on my machine:

http://localhost:5000/xxxx.html
http://127.0.0.1:5000/xxxx.html
http://[fe80::1]:5000/xxxx.html

All fail on error 403.

How can this issue be reproduced?

Server is a development server nginx started and controlled by PYCharm v 2202.3.3. This has been running well in this configuration until the current Brave Browser upgrade.

Relevant hardware: Apple M2 OSX V13.2.1

Python application and related html/css is unchanged and unaltered since 2019.

Expected result:

Web page on localhost executing python code and returning a result.

Brave Version( check About Brave):

Version 1.48.171 Chromium: 110.0.5481.177 (Official Build) (arm64)

Additional Information:

This longstanding internal development application works on the following browsers without modification:

1. Safari Version 16.3 (18614.4.6.1.6)
2. Firefox 111.0.1 (64-bit)
3. Chromium/Google Chrome

The application does not use cookies, or anything fancy it is very plain. It does some local lookups and a calculation in python and returns a result. That’s it.