Breadcrumb incorrect when switching between new platform apps

[smith]

Kibana version:

8.0.0 (master)

Browser version:

Edge/Mac 81.0.416.68
Chrome/Mac 81.0.4044.138

Browser OS version:

macOS 10.15.5 Beta (19F53f)

Original install method (e.g. download page, yum, from source, etc.):

Source
Describe the bug:

The breadcrumb for "Uptime" can show in the "APM" app.

Presumably this can happen for other apps but this is the combination I've been able to most consistently reproduce.

Steps to reproduce:

1. Open kibana
2. Use the navigation bar to go to uptime
3. Quickly use the navigation bar to go to APM (you may have to try switching back and forth a few times, making sure to swith before uptime has completely loaded)

Expected behavior:

Should show the APM breadcrumbs, but instead Shows "APM" for a second but then changes back to Uptime.

Errors in browser console (if relevant):

None

[elasticmachine]

Pinging @elastic/apm-ui (Team:apm)

[elasticmachine]

Pinging @elastic/uptime (Team:uptime)

[sorenlouv]

This also happens when going to other apps, in this case visualize:

@elastic/uptime Is it possible that the uptime app doesn't unmount when the user navigates away and thereby stays in the background? APM and some other apps uses unmountComponentAtNode but I didn't see any mention of this in the Uptime plugin. Either it's handled differently or not at all.