Document Server" errors - Can't set property 'Rk'

Hi all,

I have NC 20.0.1 running in an Ubuntu 20 VM via snap. My logs are full of document server errors, any ideas on what’s going on here?

Operating System: Linux 5.4.0-53-generic x86_64
PHP: 7.4.11
DB: mysql 5.7.32

System Report: https://trachenet.duckdns.org/index.php/s/2s8NQJsfCGq8R5T

[documentserver_community] Error: OCA\DocumentServer\Document\DocumentConversionException: change_code: d.aa[a-1].Rk=null:a<=d.aa.length-1&&(d.aa[a].nk=null)};Uq.prototype.yM=function(d,a){d.Rb(a.rb())};Uq.prototype.XN=function(d){return AscCommon.Fg.cg(d.cc())};Uq.prototype.nh=function(){for(var d=this.Na,a=0,c=this.wd.length;a<c;++a){var e=d.Qo.En(AscCommon.G9,!0!==this.jA?this.Qa:this.Vm[a]);if(!1!==e){var h=d.aa.splice(e,1);d.jY(h);AscCommon.Kd.b7(d,e,1);for(var f=0;f<h.length;++f)h[f].mw()&&(h[f].abb(!0),h[f].XR());0<e?e<=d.aa.length-1?(d.aa[e-1].Rk=d.aa[e],d.aa[e].nk=d.aa[e-1]):d.aa[e-1].Rk=null:
change: Uncaught TypeError: Cannot set property 'Rk' of undefined
DoctRenderer:<result><error index="7304" /></result>
 at <<closure>>

0. /var/snap/nextcloud/24051/nextcloud/extra-apps/documentserver_community/lib/DocumentConverter.php line 123
   OCA\DocumentServer\Document\ConverterBinary->run("/tmp/oc_tmp_NJNxJy-.xml", null)
1. /var/snap/nextcloud/24051/nextcloud/extra-apps/documentserver_community/lib/DocumentConverter.php line 78
   OCA\DocumentServer\DocumentConverter->runCommand(OCA\DocumentServ ... {})
2. /var/snap/nextcloud/24051/nextcloud/extra-apps/documentserver_community/lib/Document/DocumentStore.php line 155
   OCA\DocumentServer\DocumentConverter->saveChanges("*** sensitive parameter replaced ***", ["76;AgAAADEA//8 ... "], "/var/snap/nextc ... x", "docx")
3. /var/snap/nextcloud/24051/nextcloud/extra-apps/documentserver_community/lib/LocalAppData.php line 100
   OCA\DocumentServer\Document\DocumentStore->OCA\DocumentServer\Document\{closure}("*** sensitive parameters replaced ***")
4. /var/snap/nextcloud/24051/nextcloud/extra-apps/documentserver_community/lib/Document/DocumentStore.php line 175
   OCA\DocumentServer\LocalAppData->getReadWriteLocalPath(OC\Files\SimpleFS\SimpleFolder {}, Closure {})
5. /var/snap/nextcloud/24051/nextcloud/extra-apps/documentserver_community/lib/Document/SaveHandler.php line 56
   OCA\DocumentServer\Document\DocumentStore->saveChanges(3615016705, [OCA\DocumentSer ... }])
6. /var/snap/nextcloud/24051/nextcloud/extra-apps/documentserver_community/lib/BackgroundJob/Cleanup.php line 69
   OCA\DocumentServer\Document\SaveHandler->flushChanges(3615016705)
7. /snap/nextcloud/24051/htdocs/lib/public/BackgroundJob/Job.php line 80
   OCA\DocumentServer\BackgroundJob\Cleanup->run(null)
8. /snap/nextcloud/24051/htdocs/cron.php line 127
   OCP\BackgroundJob\Job->execute(OC\BackgroundJob\JobList {}, OC\Log {})

at 2020-11-24T16:03:21+00:00