WordPress Network: incorrect paths to plugin assets

I have recently set up a WordPress network and I’ve noticed that the paths to plugin assets, such as JS, CSS and images, are all broken on all network sites, except the initial one.

For example, for the plugin “WP Dashboard Notes”, a CSS file path is incorrect like so:

https://example.coms/assets/css/wpdn_admin.css?ver=1.0.5

Another example. for the plugin “SiteOrigin Widget Bundle”, a CSS path is incorrect like so:

https://example.come/base/js/admin.min.js?ver=1.4.4

The same error pattern for all other plugin assets occurs, with the last letter of the plugin name appearing instead of the path to the plugin. This means that plugins don’t work correctly on network sites.

I’ve actually encountered this several times before on Network installs. unsure of the reason.