Error Message - Could not convert to Markdown : 1:33 missing "}"

Operating system

Windows

Joplin version

3.6.15

Desktop version info

Joplin 3.6.15 (prod, win32)

Device: win32, Intel(R) Core(TM) i7-9700 CPU @ 3.00GHz
Client ID: a7271a7b5efd4f9e97bd4be582800445
Sync Version: 3
Profile Version: 49
Keychain Supported: Yes
Alternative instance ID: -
Sync target: Joplin Cloud
Editor: Markdown

Revision: c615726

Backup: 1.5.1
Easy Backlinks: 1.3.1
Hotfolder: 1.2.3
Joplin to Todoist: 1.0.2

Editor

Markdown Editor

What issue do you have?

I forwarded a message from Gmail into Joplin and it created a note in HTML format.
This note displays a banner saying it is in HTML format with a link to convert it to Markdown.
When I click the convert link I get a pop up containing the following message -
"Could not convert to Markdown : 1:33 missing "}""
Any ideas why it thinks there is a "}" missing and how to fix it.

Screenshots