Tor crashes if ClientOnionAuthDir contains more than one private key for a hidden service

OS: Arch Linux,

Minimum torrc to reproduce problem:

ClientOnionAuthDir /var/lib/tor/auth

In /var/lib/tor/auth place a file, for example "key1.auth_private" with:

squlj76moawedtuiixydwlzj65323e6k232bpogd4xrrsz4bgcunyqad:descriptor:x25519:XX5M5YQVTGCXPS3E6G6AGOUZYFISOLMSXLD2E3BTL22DUQZLHK4Q

then do

# cp /var/lib/tor/auth/key1.auth_private /var/lib/tor/auth/key2.auth_private
# tor -f /etc/tor/torrc

This yields the traceback:

Jan 10 03:57:29.597 [notice] Tor 0.3.5.7 running on Linux with Libevent 2.1.8-stable, OpenSSL 1.1.1a, Zlib 1.2.11, Liblzma 5.2.4, and Libzstd 1.3.7.
Jan 10 03:57:29.598 [notice] Tor can't help you if you use it wrong! Learn how to be safe at https://www.torproject.org/download/download#warning
Jan 10 03:57:29.598 [notice] Read configuration file "/etc/tor/torrc".
Jan 10 03:57:29.612 [err] tor_assertion_failed_(): Bug: src/app/config/config.c:890: get_options_mutable: Assertion global_options failed; aborting. (on Tor 0.3.5.7 )
Jan 10 03:57:29.614 [err] Bug: Assertion global_options failed in get_options_mutable at src/app/config/config.c:890. Stack trace: (on Tor 0.3.5.7 )
Jan 10 03:57:29.614 [err] Bug:     tor(log_backtrace_impl+0x48) [0x571747260a18] (on Tor 0.3.5.7 )
Jan 10 03:57:29.614 [err] Bug:     tor(tor_assertion_failed_+0x97) [0x57174725bee7] (on Tor 0.3.5.7 )
Jan 10 03:57:29.614 [err] Bug:     tor(get_options_mutable+0x60) [0x5717471dc1d0] (on Tor 0.3.5.7 )
Jan 10 03:57:29.614 [err] Bug:     tor(safe_str_client+0x22) [0x5717471dc552] (on Tor 0.3.5.7 )
Jan 10 03:57:29.614 [err] Bug:     tor(hs_config_client_authorization+0x5a0) [0x571747168e10] (on Tor 0.3.5.7 )
Jan 10 03:57:29.614 [err] Bug:     tor(hs_config_client_auth_all+0x30) [0x5717471fa7f0] (on Tor 0.3.5.7 )
Jan 10 03:57:29.614 [err] Bug:     tor(+0x1798ab) [0x5717471e38ab] (on Tor 0.3.5.7 )
Jan 10 03:57:29.614 [err] Bug:     tor(options_init_from_string+0x364) [0x5717471e7d34] (on Tor 0.3.5.7 )
Jan 10 03:57:29.614 [err] Bug:     tor(options_init_from_torrc+0x376) [0x5717471e82f6] (on Tor 0.3.5.7 )
Jan 10 03:57:29.614 [err] Bug:     tor(tor_init+0x32a) [0x5717470bd7ba] (on Tor 0.3.5.7 )
Jan 10 03:57:29.614 [err] Bug:     tor(tor_run_main+0xcd) [0x5717470be54d] (on Tor 0.3.5.7 )
Jan 10 03:57:29.614 [err] Bug:     tor(tor_main+0x3b) [0x5717470bc62b] (on Tor 0.3.5.7 )
Jan 10 03:57:29.614 [err] Bug:     tor(main+0x1a) [0x5717470bc1ba] (on Tor 0.3.5.7 )
Jan 10 03:57:29.614 [err] Bug:     /usr/lib/libc.so.6(__libc_start_main+0xf3) [0x74f0206a9223] (on Tor 0.3.5.7 )
Jan 10 03:57:29.614 [err] Bug:     tor(_start+0x2e) [0x5717470bc21e] (on Tor 0.3.5.7 )

Trac:
Username: demfloro