core.entity_view_display.contact_message.kontaktujte_nas.default - this means you have an entity bundle
kontaktujte_nas of entity type
contact_message, which has Layout Builder enabled on the
default display and have enabled the per-entity layout option.
When you enable the per-entity layout option, Layout Builder adds a hidden
layout_builder__layout field on that bundle. That field stores the layout configuration for a single entity of that bundle and uses that instead of the layout defined on the type. In your case, that's the
field.contact_message.kontaktujte_nas.layout_builder__layout field configuration - you need this file present config during import.
Depending on when you started using Layout Builder, there might be one more configuration file you need in there, a
field.storage.contact_message.layout_builder__layout - which defines the DB schema of the layout field (field configs come in pairs, the instance (
field.field.*) and the schema config (
field.storage.*). The layout field may not have the former because it's not a visible field, but will certainly have the latter.).