LoadingOverlay: Causing host already attached error

[benjamincharity]

When reporting an issue, please fill out these questions and follow the steps.

1. What is the expected behavior?

No error

2. What is the current behavior?

Causing an error:

rollbar.umd.min.js:2 Error: Host already has a portal attached
    at throwPortalAlreadyAttachedError (portal.es5.js:30) [angular]
    at DomPortalOutlet.push../node_modules/@angular/cdk/esm5/portal.es5.js.BasePortalOutlet.attach (portal.es5.js:289) [angular]
    at TsLoadingOverlayDirective.set [as tsLoadingOverlay] (terminus-ui-loading-overlay.js:78) [angular]
    at updateProp (core.js:22304) [angular]
    at checkAndUpdateDirectiveInline (core.js:22055) [angular]
    at checkAndUpdateNodeInline (core.js:23362) [angular]
    at checkAndUpdateNode (core.js:23324) [angular]
    at debugCheckAndUpdateNode (core.js:23958) [angular]
    at debugCheckDirectivesFn (core.js:23918) [angular]
    at Object.eval [as updateDirectives] (ListDetailsComponent.html:18) [angular]
    at Object.debugUpdateDirectives [as updateDirectives] (core.js:23910) [angular]
    at checkAndUpdateView (core.js:23306) [angular]
    at callViewAction (core.js:23547) [angular]
    at execEmbeddedViewsAction (core.js:23510) [angular]

3. What are the steps to reproduce?

Providing a reproduction is the best way to share your issue.

Reproducible when going from a route with an overlay to another route with an overlay.

4. Which versions of this library, Angular, TypeScript, & browsers are affected?

• UI Library: v11 & v12
• Angular:
• TypeScript:
• Browser(s):