Dock crashing because of moving application folder from finder to the dock and then to the trash.

Try running this command in the Terminal…

killall Dock

Then if the icon is still there, try control clicking on the icon and choose "Remove from Dock" from "Options".

It's not a bug as you're the first to experience it here.

Have you installed and run any "cleaning", "optimizing", "speed-up", anti-virus or VPN apps on your Mac?

Download and run Etrecheck. Be sure to give it Full Disk access before running.

Copy and paste the results into your reply. Etrecheck is a diagnostic tool that was developed by one of the most respected users here in the ASC and recommended by Apple Support  to provide a snapshot of the system and help identify the more obvious culprits that can adversely affect a Mac's performance.

Copy the report

and use the Additional Text button to paste the report in your reply.

Then we can evaluate the report to see if we can determine the cause of the problem.

If everyone had the same problem then it would be a "bug". If not, it's a problem local to your Mac. Feel free to send Apple a bug report from the feedback page.

Feedback - macOS - Apple