"Open chat in editor" doesn't work

[roblourens]

• Start a chat in panel
• In the view title, use the "Open chat in editor" command
• An empty chat editor is opened

  ERR Failed to parse chat data TypeError: Cannot set property slashCommands of #<Object> which has only a getter
    at revive (/Users/roblou/code/vscode/src/vs/base/common/marshalling.ts:73:14)
    at reviveSerializedAgent (/Users/roblou/code/vscode/src/vs/workbench/contrib/chat/common/chatAgents.ts:534:15)
    at /Users/roblou/code/vscode/src/vs/workbench/contrib/chat/common/chatParserTypes.ts:157:34