Inbox only loads once, or until cache cleared

[Achoobert]

Describe the bug

For me, a newly created inbox item will almost immediatly appear:

If I open accounting in a new tab, or refresh, the inbox will appear to be empty.

New items will be addded to that 'empty' inbox just fine.

Clearing cache will make all inbox items display

To Reproduce
Have inbox items on accounting, reload the page or open a new tab

Expected behavior
inbox should stay the same accross tabs and refreshes without users having to clear cache.