tor : TLS error: internal error (in SSL routines:tls13_hkdf_expand:---)

Ubuntu: Disco 19.04
tor: 0.3.4.9-7

syslog is currently filled with the following

Jan 6 23:19:48 vps39184 Tor[1162]: TLS error: internal error (in SSL routines:tls13_hkdf_expand:---)
Jan 6 23:19:49 vps39184 Tor[1162]: tor_bug_occurred_(): Bug: ../src/or/main.c:1047: conn_close_if_marked: Non-fatal assertion !(connection_is_reading(conn)) failed. (on Tor 0.3.4.9 )

about once every few minutes

with the occasional failed assertion:

Jan 6 23:19:49 vps39184 Tor[1162]: Bug: Non-fatal assertion !(connection_is_reading(conn)) failed in conn_close_if_marked at ../src/or/main.c:1047. Stack trace: (on Tor 0.3.4.9 )
Jan 6 23:19:49 vps39184 Tor[1162]: Bug: /usr/bin/tor(log_backtrace+0x43) [0x5623d87c7953] (on Tor 0.3.4.9 )
Jan 6 23:19:49 vps39184 Tor[1162]: Bug: /usr/bin/tor(tor_bug_occurred_+0xb9) [0x5623d87e2639] (on Tor 0.3.4.9 )
Jan 6 23:19:49 vps39184 Tor[1162]: Bug: /usr/bin/tor(+0x52484) [0x5623d8690484] (on Tor 0.3.4.9 )
Jan 6 23:19:49 vps39184 Tor[1162]: Bug: /usr/bin/tor(+0x528ce) [0x5623d86908ce] (on Tor 0.3.4.9 )
Jan 6 23:19:49 vps39184 Tor[1162]: Bug: /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6(+0x1ea11) [0x7f4a778aca11] (on Tor 0.3.4.9 )
Jan 6 23:19:49 vps39184 Tor[1162]: Bug: /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6(event_base_loop+0x53f) [0x7f4a778ad33f] (on Tor 0.3.4.9 )
Jan 6 23:19:49 vps39184 Tor[1162]: Bug: /usr/bin/tor(do_main_loop+0x205) [0x5623d8692ad5] (on Tor 0.3.4.9 )
Jan 6 23:19:49 vps39184 Tor[1162]: Bug: /usr/bin/tor(tor_run_main+0x1005) [0x5623d86951a5] (on Tor 0.3.4.9 )
Jan 6 23:19:49 vps39184 Tor[1162]: Bug: /usr/bin/tor(tor_main+0x3a) [0x5623d868d0fa] (on Tor 0.3.4.9 )
Jan 6 23:19:49 vps39184 Tor[1162]: Bug: /usr/bin/tor(main+0x19) [0x5623d868cea9] (on Tor 0.3.4.9 )
Jan 6 23:19:49 vps39184 Tor[1162]: Bug: /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xeb) [0x7f4a76db209b] (on Tor 0.3.4.9 )
Jan 6 23:19:49 vps39184 Tor[1162]: Bug: /usr/bin/tor(_start+0x2a) [0x5623d868cefa] (on Tor 0.3.4.9 )

This seems to go back to at least dec 24 or so, which is the limit of where my logs go

Tor does still seem to work, but this still can't be right.

ProblemType: Bug
DistroRelease: Ubuntu 19.04
Package: tor 0.3.4.9-7
ProcVersionSignature: Ubuntu 4.18.0-11.12-generic 4.18.12
Uname: Linux 4.18.0-11-generic x86_64
ApportVersion: 2.20.10-0ubuntu14
Architecture: amd64
Date: Mon Jan 7 00:35:16 2019
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: tor
UpgradeStatus: Upgraded to disco on 2018-11-23 (44 days ago)
modified.conffile..etc.tor.torrc: [modified]
mtime.conffile..etc.tor.torrc: 2018-10-27T20:22:01.769813