HSv3: Bug Non-fatal assertion in hs_client.c:518: intro_circ_is_ok

Client side HSv3 non fatal bug. It occurs like between ~80-120 times in a total of 100.000 built rendezvous circuits:

Mar 31 18:44:17.000 [warn] tor_bug_occurred_(): Bug: ../src/feature/hs/hs_client.c:518: intro_circ_is_ok: Non-fatal assertion !(!hs_ident_intro_circ_is_valid(circ->hs_ident)) failed. (on Tor 0.4.4.0-alpha-dev )
Mar 31 18:44:17.000 [warn] Bug: Tor 0.4.4.0-alpha-dev: Non-fatal assertion !(!hs_ident_intro_circ_is_valid(circ->hs_ident)) failed in intro_circ_is_ok at ../src/feature/hs/hs_client.c:518. Stack trace: (on Tor 0.4.4.0-alpha-dev )
Mar 31 18:44:17.000 [warn] Bug:     tor(log_backtrace_impl+0x56) [0x55d874ac7ee6] (on Tor 0.4.4.0-alpha-dev )
Mar 31 18:44:17.000 [warn] Bug:     tor(tor_bug_occurred_+0x16c) [0x55d874ac30ec] (on Tor 0.4.4.0-alpha-dev )
Mar 31 18:44:17.000 [warn] Bug:     tor(hs_client_send_introduce1+0x271) [0x55d8749ce5e1] (on Tor 0.4.4.0-alpha-dev )
Mar 31 18:44:17.000 [warn] Bug:     tor(connection_ap_handshake_attach_circuit+0x3bd) [0x55d874949d5d] (on Tor 0.4.4.0-alpha-dev )
Mar 31 18:44:17.000 [warn] Bug:     tor(connection_ap_attach_pending+0x178) [0x55d87494e108] (on Tor 0.4.4.0-alpha-dev )
Mar 31 18:44:17.000 [warn] Bug:     tor(circuit_send_next_onion_skin+0x2b8) [0x55d874930d38] (on Tor 0.4.4.0-alpha-dev )
Mar 31 18:44:17.000 [warn] Bug:     tor(+0xbe4ba) [0x55d8749664ba] (on Tor 0.4.4.0-alpha-dev )
Mar 31 18:44:17.000 [warn] Bug:     tor(+0xbf1c5) [0x55d8749671c5] (on Tor 0.4.4.0-alpha-dev )
Mar 31 18:44:17.000 [warn] Bug:     tor(circuit_receive_relay_cell+0x2b4) [0x55d874968a44] (on Tor 0.4.4.0-alpha-dev )
Mar 31 18:44:17.000 [warn] Bug:     tor(command_process_cell+0x2c8) [0x55d87494b788] (on Tor 0.4.4.0-alpha-dev )
Mar 31 18:44:17.000 [warn] Bug:     tor(channel_tls_handle_cell+0x4eb) [0x55d87492af0b] (on Tor 0.4.4.0-alpha-dev )
Mar 31 18:44:17.000 [warn] Bug:     tor(+0xac5ca) [0x55d8749545ca] (on Tor 0.4.4.0-alpha-dev )
Mar 31 18:44:17.000 [warn] Bug:     tor(connection_handle_read+0xa92) [0x55d8749183a2] (on Tor 0.4.4.0-alpha-dev )
Mar 31 18:44:17.000 [warn] Bug:     tor(+0x75609) [0x55d87491d609] (on Tor 0.4.4.0-alpha-dev )
Mar 31 18:44:17.000 [warn] Bug:     /lib/x86_64-linux-gnu/libevent-2.1.so.6(+0x229ba) [0x7f1984b569ba] (on Tor 0.4.4.0-alpha-dev )
Mar 31 18:44:17.000 [warn] Bug:     /lib/x86_64-linux-gnu/libevent-2.1.so.6(event_base_loop+0x5a7) [0x7f1984b57537] (on Tor 0.4.4.0-alpha-dev )
Mar 31 18:44:17.000 [warn] Bug:     tor(do_main_loop+0xff) [0x55d87491e88f] (on Tor 0.4.4.0-alpha-dev )
Mar 31 18:44:17.000 [warn] Bug:     tor(tor_run_main+0x10b5) [0x55d87490bbc5] (on Tor 0.4.4.0-alpha-dev )
Mar 31 18:44:17.000 [warn] Bug:     tor(tor_main+0x3a) [0x55d8749092ca] (on Tor 0.4.4.0-alpha-dev )
Mar 31 18:44:17.000 [warn] Bug:     tor(main+0x19) [0x55d874908e89] (on Tor 0.4.4.0-alpha-dev )
Mar 31 18:44:17.000 [warn] Bug:     /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xeb) [0x7f198443809b] (on Tor 0.4.4.0-alpha-dev )
Mar 31 18:44:17.000 [warn] Bug:     tor(_start+0x2a) [0x55d874908eda] (on Tor 0.4.4.0-alpha-dev )