System wide alert does not display in DSpace 8

[MW3000]

trafficstars

Describe the bug

System wide alert does not display in DSpace 8.x If you turn on system wide alert and save, it might temporarily show up in your logged in session, but when you check in another browser or logout and reload the site it will not be visible for not logged in users. Sometimes it might flash up for a second and disappear again.

There also is an error message at the browser console. This is taken from https://demo.dspace.org:

[Error] ERROR
Error: undefined is not a valid constructor for {"type":"systemwidealert","alertId":1,"message":"Test the system wide alert feature! New try","countdownTo":null,"active":true,"_links":{"self":{"href":"https://demo.dspace.org/server/api/system/systemwidealerts/1"}}}
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(anonymous function) — main.4e36a1fc2ea53912.js:1:1907222
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next — main.4e36a1fc2ea53912.js:1:1892448
(anonymous function) — main.4e36a1fc2ea53912.js:1:1907215
(anonymous function) — main.4e36a1fc2ea53912.js:1:1903613
next — main.4e36a1fc2ea53912.js:1:1892448
(anonymous function) — main.4e36a1fc2ea53912.js:1:1903613
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(anonymous function) — main.4e36a1fc2ea53912.js:1:1907215
(anonymous function) — main.4e36a1fc2ea53912.js:1:1903613
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(anonymous function) — main.4e36a1fc2ea53912.js:1:1897113
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(anonymous function) — main.4e36a1fc2ea53912.js:1:1905747
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(anonymous function) — main.4e36a1fc2ea53912.js:1:1907215
(anonymous function) — main.4e36a1fc2ea53912.js:1:1903613
next — main.4e36a1fc2ea53912.js:1:1892448
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(anonymous function) — main.4e36a1fc2ea53912.js:1:1907194
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c — main.4e36a1fc2ea53912.js:1:1919888
subscribe — main.4e36a1fc2ea53912.js:1:1888103
(anonymous function) — main.4e36a1fc2ea53912.js:1:1905689
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c — main.4e36a1fc2ea53912.js:1:1919888
subscribe — main.4e36a1fc2ea53912.js:1:1888103
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M — main.4e36a1fc2ea53912.js:1:1897200
(anonymous function) — main.4e36a1fc2ea53912.js:1:1897016
M — main.4e36a1fc2ea53912.js:1:1897200
(anonymous function) — main.4e36a1fc2ea53912.js:1:1896942
_trySubscribe — main.4e36a1fc2ea53912.js:1:1888252
(anonymous function) — main.4e36a1fc2ea53912.js:1:1888200
c — main.4e36a1fc2ea53912.js:1:1919888
subscribe — main.4e36a1fc2ea53912.js:1:1888103
(anonymous function) — main.4e36a1fc2ea53912.js:1:1907194
(anonymous function) — main.4e36a1fc2ea53912.js:1:1921682
(anonymous function) — main.4e36a1fc2ea53912.js:1:1888155
c — main.4e36a1fc2ea53912.js:1:1919888
subscribe — main.4e36a1fc2ea53912.js:1:1888103
(anonymous function) — main.4e36a1fc2ea53912.js:1:1905916
(anonymous function) — main.4e36a1fc2ea53912.js:1:1921682
(anonymous function) — main.4e36a1fc2ea53912.js:1:1888155
c — main.4e36a1fc2ea53912.js:1:1919888
subscribe — main.4e36a1fc2ea53912.js:1:1888103
(anonymous function) — main.4e36a1fc2ea53912.js:1:1907194
(anonymous function) — main.4e36a1fc2ea53912.js:1:1921682
(anonymous function) — main.4e36a1fc2ea53912.js:1:1888155
c — main.4e36a1fc2ea53912.js:1:1919888
subscribe — main.4e36a1fc2ea53912.js:1:1888103
(anonymous function) — main.4e36a1fc2ea53912.js:1:1907194
(anonymous function) — main.4e36a1fc2ea53912.js:1:1921682
(anonymous function) — main.4e36a1fc2ea53912.js:1:1888155
c — main.4e36a1fc2ea53912.js:1:1919888
subscribe — main.4e36a1fc2ea53912.js:1:1888103
(anonymous function) — main.4e36a1fc2ea53912.js:1:1897068
M — main.4e36a1fc2ea53912.js:1:1897200
(anonymous function) — main.4e36a1fc2ea53912.js:1:1897016
M — main.4e36a1fc2ea53912.js:1:1897200
(anonymous function) — main.4e36a1fc2ea53912.js:1:1896942
_trySubscribe — main.4e36a1fc2ea53912.js:1:1888252
(anonymous function) — main.4e36a1fc2ea53912.js:1:1888200
c — main.4e36a1fc2ea53912.js:1:1919888
subscribe — main.4e36a1fc2ea53912.js:1:1888103
(anonymous function) — main.4e36a1fc2ea53912.js:1:1907194
(anonymous function) — main.4e36a1fc2ea53912.js:1:1921682
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c — main.4e36a1fc2ea53912.js:1:1919888
subscribe — main.4e36a1fc2ea53912.js:1:1888103
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next — main.4e36a1fc2ea53912.js:1:1892448
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next — main.4e36a1fc2ea53912.js:1:1892448
(anonymous function) — main.4e36a1fc2ea53912.js:1:1907215
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next — main.4e36a1fc2ea53912.js:1:1892448
(anonymous function) — main.4e36a1fc2ea53912.js:1:1907215
(anonymous function) — main.4e36a1fc2ea53912.js:1:1903613
next — main.4e36a1fc2ea53912.js:1:1892448
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next — main.4e36a1fc2ea53912.js:1:1892448
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(anonymous function) — main.4e36a1fc2ea53912.js:1:1903613
	handleError (main.4e36a1fc2ea53912.js:1:2190754)
	next (main.4e36a1fc2ea53912.js:1:2301833)
	next (main.4e36a1fc2ea53912.js:1:1893068)
	_next (main.4e36a1fc2ea53912.js:1:1892752)
	next (main.4e36a1fc2ea53912.js:1:1892448)
	(anonymous function) (main.4e36a1fc2ea53912.js:1:1890410)
	c (main.4e36a1fc2ea53912.js:1:1919888)
	next (main.4e36a1fc2ea53912.js:1:1890245)
	emit (main.4e36a1fc2ea53912.js:1:2191786)
	run (polyfills.a1b1172df5a5f0a4.js:1:25438)
	onHandleError (main.4e36a1fc2ea53912.js:1:2229518)
	runTask (polyfills.a1b1172df5a5f0a4.js:1:26183)
	invokeTask (polyfills.a1b1172df5a5f0a4.js:1:32046)

To Reproduce

Steps to reproduce the behavior: You can reproduce on https://demo.dspace.org

1. Login as admin
2. Go to System Wide Alert, fill in a system wide alert, enable the alert, click save
3. Open the site in another browser, or logout and reload
4. There is no alert displayed
5. You might get an error message on the browser console

Expected behavior

The system wide alert should display reliable when turned on.