MCP Apps stopped rendering in 3.10.20 (worked in 3.9.16)

[Cameron_Yick]

@mohitjain

1. Does the widget fail on every tool call, or does it occasionally render?
2. Does a window reload (Cmd+Shift+P → “Developer: Reload Window”), or toggling the MCP server off and back on in Settings, ever make it appear? If it does, that’s also a temporary workaround.

I was redirected here from MCP Apps do not supporting user text inputs - #13 by Colin , sharing my answers in case it helps to debug

1. It fails on every tool call involving an MCP app, see linked thread for detail
2. I have a ‘reload window’ prefix with cmd+shift+p, the old “Developer” prefix is no longer present in 3.10.x. Using it doesn’t help.