Mdi.icons have disappeared

Hello All
Noticed today that many of the mdi:icons have disappeared from the selection list. Many of my switches do not have icons above them any longer and when editing the entries and selecting an icon to represent that switch, several of the mdi:icons no longer have the icons showing.
Any ideas?

Do you have custom icons installed?

Clear your browser cache

I have mushroom cards but the icons are the standard listed mdi: set from the drop down list

Then go with @PeteRage advice and clear your browser cache as step 1.

That worked, thanks

That worked

Is there a known reason for this? On my iPad in HA app, I have dozends of standard icons each day, sometimes this sometimes that, which are not displayed on opening the app. Only a pull refresh brings them then back directly.

Problem started only some releases ago.

This is the first time that I had it happen. It looks like it is something that should be elevated to the core team