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Thank you for the reproducer and patch! I am able to reproduce it with the upstream git HEAD. The proposed patch makes sense to me. I will propose it upstream on your behalf.
It turned out that the proposed patch does not work as expected. There are more places in the code where (conn->http_proxy.proxytype == CURLPROXY_HTTPS) is checked regardless of the conn->bits.httpproxy flag, which resulted in hanging or crashes on other code paths. So I ended up with attachment #1713334[details], which seems to work better. Martin, could you please have a look at it?
If you are fine with attachment #1713334[details], I will open an upstream pull request for it, either with you as the commit author, or bug reporter, whichever you prefer.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory (Moderate: curl security and bug fix update), and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHSA-2021:1610