Pamac AUR is fine on my side. I see google-chrome
I would rather suggest to use pamac from terminal to see the output
$ pamac search google-chrome
chromedriver-dev 80.0.3987.16-1 AUR
Standalone server which implements WebDriver's wire protocol (for google-chrome-dev)
chromedriver-beta 86.0.4240.22-1 AUR
Standalone server that implements the W3C WebDriver standard (for google-chrome)
chromedriver 86.0.4240.22-1 AUR
Standalone server that implements the W3C WebDriver standard (for google-chrome)
google-chrome-dev 87.0.4280.11-1 AUR
The popular and trusted web browser by Google (Dev Channel)
google-chrome-beta 86.0.4240.75-1 AUR
The popular and trusted web browser by Google (Beta Channel)
google-chrome 86.0.4240.75-1 AUR
The popular and trusted web browser by Google (Stable Channel)
Note: I’m not on stable channel but I don’t think your issue is related.