Panel Menu Icons

I have a very strange problem with Panel Menu Icons. When just opening the first level submenu it shows all items with icons as it should be but if I select any of Items all icons except the icon of a first item are gone. And to be strange more, during preparing example for this post I commented several items (to make it shorter) but then appear another thing. When I selected any of the item icons disappeared as it was but those commented items showed from nowhere as they were commented in a source code.
Code:

<RadzenPanelMenuItem Text="Zakonski šifarnici" Icon="gavel">
             <RadzenPanelMenuItem Text="Rizici" Path="b-r-s-o-g" Icon="new_releases"></RadzenPanelMenuItem>
             <RadzenPanelMenuItem Text="Profesionalne bolesti" Path="b-r-b-o-l" Icon="sick"></RadzenPanelMenuItem>
             <RadzenPanelMenuItem Text="Dijagnoze povreda na radu" Icon="personal_injury" Path="b-r-m-s-l"></RadzenPanelMenuItem>
             <RadzenPanelMenuItem Text="Države" Icon="flag_circle" Path="b-r-d-r-z"></RadzenPanelMenuItem>
             <RadzenPanelMenuItem Text="Naselja" Icon="location_city" Path="b-r-n-a-s"></RadzenPanelMenuItem>
             <RadzenPanelMenuItem Text="Povređeni deo tela" Icon="settings_accessibility" Path="b-r-p-d-t"></RadzenPanelMenuItem>
             <RadzenPanelMenuItem Text="Proces rada" Icon="production_quantity_limits" Path="b-r-p-r-r"></RadzenPanelMenuItem>
@*           <RadzenPanelMenuItem Text="Radni status" Icon="badge" Path="b-r-r-d-s"></RadzenPanelMenuItem>
             <RadzenPanelMenuItem Text="Radna sredina" Icon="sync_problem" Path="b-r-r-s-r"></RadzenPanelMenuItem>
             <RadzenPanelMenuItem Text="Specifična fizička aktivnost" Icon="hiking" Path="b-r-s-f-a"></RadzenPanelMenuItem>
             <RadzenPanelMenuItem Text="Uzroci povreda za povrednu listu" Icon="swipe_left" Path="b-r-u-z-p"></RadzenPanelMenuItem>
             <RadzenPanelMenuItem Text="Izvori povreda" Icon="cable" Path="b-r-i-z-p"></RadzenPanelMenuItem>
             <RadzenPanelMenuItem Text="Sa čime je bio povređeni u kontaktu" Icon="contacts" Path="b-r-k-o-n"></RadzenPanelMenuItem>
             <RadzenPanelMenuItem Text="Zanimanja" Icon="engineering" Path="b-r-z-a-n"></RadzenPanelMenuItem> *@
</RadzenPanelMenuItem>

And first picture shows submenu before item select


Second picture show submenu after item select

Any explanations?

Is it possible that the page is partially cached?

Some time ago, in the positions where you can't see the icons, they weren't there, but the addition of the icons was done about 7 days ago. That could explain the disappearance of icons and the appearance of commented code.

Seems to work just fine in the online demo: Blazor PanelMenu Component | Free UI Components by Radzen

Let us know if you manage to reproduce it somehow.