Images disappeared after installing (then removing ) plugin on local install

Hello.

I am learning WordPress on a localhost install.

Installed several plugins:

Aksimet
WP Smush
Easy Google fonts
WP forms
Forminator
Contact form 7
Asgaros forum

Uninstalled two contact form plugins and Asgaros. Deleted the pages they created, deactivated plugin then deleted plugin.

I got an error message:

compilation failed: quantifier does not follow a repeatable item at offset \wp-includes\class-wp.php on line 223

I turned off PHP errors as I had removed these plugins and just installed WordPress with a few text image pages. (see attached image)

Now I notice images don’t show up on my site. Just a blank space where image / video / random embed should be.

The placeholder images showed before this.

Now adding removing images multiple times, they show up in Media library.

But won’t display on a page or blogpost or start page with blogposts.

I need to fix this as I have a deadline.

How can I get images back after removing this plugin?

Thanks

SCREENSHOTS AT THIS LINK https://www.asgaros.de/support/topic/installed-asgaros-plugin-error-message-images-dont-show/#postid-37264