My Home Assistant version: 2024.4.1
Layout-card version (FROM BROWSER CONSOLE): 2.4.4
What I am doing:
Consider this card in a PANEL view (default HA theme):
type: custom:layout-card
layout_type: vertical-layout
cards:
- type: entity
entity: sun.sun
- type: entity
entity: sun.sun
- type: entity
entity: sun.sun
In editor everything looks OK:

In the view - no borders & box-radius applied for child cards:
Edit mode:

Normal mode:

In masonry - everything is OK:
Edit mode:

Normal mode:

Probably related to these changes:
home-assistant/frontend#20122
home-assistant/frontend#20135
home-assistant/frontend#20264
Error messages from the browser console:
none
By putting an X in the boxes ([X]) below, I indicate that I:
My Home Assistant version: 2024.4.1
Layout-card version (FROM BROWSER CONSOLE): 2.4.4
What I am doing:
Consider this card in a PANEL view (default HA theme):
In editor everything looks OK:

In the view - no borders & box-radius applied for child cards:

Edit mode:
Normal mode:

In masonry - everything is OK:

Edit mode:
Normal mode:

Probably related to these changes:
home-assistant/frontend#20122
home-assistant/frontend#20135
home-assistant/frontend#20264
Error messages from the browser console:
none
By putting an X in the boxes ([X]) below, I indicate that I: