Sabnzbd error You don't have the C version of NameMapper installed

I’m running the latest of linuxserver/sabnzbd updated on 31 March 2021 on a CentOS 7 system. Shortly after the container starts I receive a user warning in relation to not having the C version of NameMapper installed (see below).

2021-04-01 12:33:19,520::INFO::[scheduler:201] Scheduling VersionCheck on day 2 at 11:25
2021-04-01 12:33:19,520::INFO::[scheduler:215] Setting schedule for midnight BPS reset
2021-04-01 12:33:19,520::INFO::[scheduler:218] Setting schedule for server expiration check
2021-04-01 12:33:19,520::INFO::[scheduler:223] Setting scheduler for server quota check
2021-04-01 12:33:19,520::INFO::[__init__:331] All processes started
2021-04-01 12:33:19,521::INFO::[SABnzbd:319] Template location for Glitter is /app/sabnzbd/interfaces/Glitter
2021-04-01 12:33:19,521::INFO::[SABnzbd:319] Template location for Config is /app/sabnzbd/interfaces/Config
2021-04-01 12:33:19,521::INFO::[misc:1050] [sabnzbd.misc.run_command] Running external command: ['/usr/bin/nice', '-n15', '/usr/bin/unrar']
2021-04-01 12:33:19,529::INFO::[misc:1050] [sabnzbd.misc.run_command] Running external command: ['/usr/bin/nice', '-n15', '/usr/bin/par2', '-h']
2021-04-01 12:33:19,534::INFO::[SABnzbd:413] SABYenc module (v4.0.2)... found!
2021-04-01 12:33:19,534::INFO::[SABnzbd:432] Cryptography module (v3.4.7)... found!
2021-04-01 12:33:19,534::INFO::[SABnzbd:437] par2 binary... found (/usr/bin/par2)
2021-04-01 12:33:19,534::INFO::[SABnzbd:444] UNRAR binary... found (/usr/bin/unrar)
2021-04-01 12:33:19,534::INFO::[SABnzbd:454] UNRAR binary version 6.00
2021-04-01 12:33:19,534::INFO::[SABnzbd:462] 7za binary... found (/usr/bin/7za)
2021-04-01 12:33:19,534::INFO::[SABnzbd:473] nice binary... found (/usr/bin/nice)
2021-04-01 12:33:19,534::INFO::[SABnzbd:477] ionice binary... found (/usr/bin/ionice)
2021-04-01 12:33:19,535::INFO::[SABnzbd:1315] HTTPS keys are OK
2021-04-01 12:33:19,536::INFO::[SABnzbd:1443] Starting web-interface on
2021-04-01 12:33:19,536::INFO::[_cplogging:216] [01/Apr/2021:12:33:19] ENGINE Bus STARTING
2021-04-01 12:33:19,640::INFO::[_cplogging:216] [01/Apr/2021:12:33:19] ENGINE Serving on
2021-04-01 12:33:19,747::INFO::[_cplogging:216] [01/Apr/2021:12:33:19] ENGINE Serving on
2021-04-01 12:33:19,747::INFO::[_cplogging:216] [01/Apr/2021:12:33:19] ENGINE Bus STARTED
2021-04-01 12:33:19,747::INFO::[SABnzbd:1480] Starting
2021-04-01 12:33:19,755::INFO::[postproc:237] Completed Download Folder /downloads/Usenet/complete is not on FAT
2021-04-01 12:33:19,756::INFO::[dirscanner:117] Dirscanner starting up
2021-04-01 12:33:19,758::INFO::[notifier:122] Sending notification: SABnzbd - SABnzbd 3.2.1 started (type=startup, job_cat=None)
2021-04-01 12:33:19,915::INFO::[zconfig:62] No bonjour/zeroconf support installed
2021-04-01 12:33:19,915::INFO::[ssdp:108] Serving SSDP on X.X.X.X as SABnzbd
2021-04-01 12:33:34,524::INFO::[rss:481] Starting scheduled RSS read-out for "NZB"
2021-04-01 12:33:50,481::INFO::[rss:497] Finished scheduled RSS read-outs
/usr/local/lib/python3.6/dist-packages/Cheetah/ UserWarning: 
You don't have the C version of NameMapper installed! I'm disabling Cheetah's useStackFrames option as it is painfully slow with the Python version of NameMapper. You should get a copy of Cheetah with compiled C version of NameMapper.
  "\nYou don't have the C version of NameMapper installed! "

I’ve attempted to correct this by uninstalling and reinstalling Cheeta3 from within the container and also on the host, but it doesn’t seem to rectify the error.

Is anyone else encountering this and been able to rectify it?