Excel Copilot WebView2 crashes when rendering download links - Bug

Excel Agent / Copilot UI becomes stuck in “Still working on it”. Subsequent prompts may receive contradictory responses claiming the session is active, while response text renders incorrectly one word per line. Generated sandbox artefacts also appear as plain text rather than downloadable file controls. Issue persists after reboot. Installed WebView2 Evergreen Runtime is 155.0.4283.62. 

Went to try and "revive" a stalled Excel agent (in browser), by starting a new conversation with an Excel agent (in browser, not in Excel).

Plain text: Definitely something wrong with Excel agent...as still unresponsive

Please can you revive the agent in this conversation as it seems to have fallen asleep and is unresponsive to last message: Excel Sandbox Download Links Suppressed

Excel said:

Excel

I’m

active

now

.

No

stalled

background

agent

is

visible

to

revive

,

and

no

workbook

exists

in

this

session

.

Please

resend

the

last

Excel

request

or

upload

the

source

file

,

and

I

’ll

recreate

the

workbook

here

.

I’m active now. No stalled background agent is visible to revive, and no workbook exists in this session. Please resend the last Excel request or upload the source file, and I’ll recreate the workbook here.