Thunderbird not showing email body

After a recent round of updates, Thunderbird (136.0-1) no longer displays the message body pane.
If I start it as thunderbird --verbose then I get the following traceback when trying to single click an email (which usually brings up the body in the pane).

JavaScript error: jar:file:///home/ghbrown/.thunderbird/banpex6g.default-release/extensions/gconversation@xulforum.org.xpi!/experiment-api/msgWindowApi.js, line 332: TypeError: contentWin.messagePane.clearMessage is not a function

Everything else continues to work, and the full log is below.
I’ve looked around here and and also on the Mozilla bugtracker and haven’t found anything, so hoping I can get a pointer in the right direction. Thanks!

[ImapModuleLoader] Using nsImapService.cpp
Warning: unrecognized command line flag -verbose
[Parent 1070454, Main Thread] WARNING: thunderbird has no capability of surrounding-text feature: 'glib warning', file /usr/src/debug/thunderbird/thunderbird-136.0/toolkit/xre/nsSigHandlers.cpp:201

(thunderbird:1070454): IBUS-WARNING **: 17:18:39.678: thunderbird has no capability of surrounding-text feature
[Parent 1070454, Main Thread] WARNING: thunderbird has no capability of surrounding-text feature: 'glib warning', file /usr/src/debug/thunderbird/thunderbird-136.0/toolkit/xre/nsSigHandlers.cpp:201

(thunderbird:1070454): IBUS-WARNING **: 17:18:39.678: thunderbird has no capability of surrounding-text feature
console.error: (new UnknownCollectionError("Unknown Collection \"thunderbird/url-parser-default-unknown-schemes-interventions\"", "resource://services-settings/RemoteSettingsClient.sys.mjs", 189))
console.error: services.settings:
  Remote Settings startup changesets bundle could not be extracted (TypeError: serverInfo.capabilities.attachments is undefined)
console.error: services.settings:
  Message: UnknownCollectionError: Unknown Collection "thunderbird/remote-permissions"
  Stack:
    UnknownCollectionError@resource://services-settings/RemoteSettingsClient.sys.mjs:189:5
sync@resource://services-settings/RemoteSettingsClient.sys.mjs:635:13

console.error: services.settings:
  Message: UnknownCollectionError: Unknown Collection "thunderbird/third-party-cookie-blocking-exempt-urls"
  Stack:
    UnknownCollectionError@resource://services-settings/RemoteSettingsClient.sys.mjs:189:5
sync@resource://services-settings/RemoteSettingsClient.sys.mjs:635:13

JavaScript error: jar:file:///home/ghbrown/.thunderbird/banpex6g.default-release/extensions/gconversation@xulforum.org.xpi!/experiment-api/msgWindowApi.js, line 332: TypeError: contentWin.messagePane.clearMessage is not a function

Culprit was found to be a Thunderbird extension which was broken via a recent update.

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