[Bug Report][4.3.0] Split button size inconsistent #23289

Environment

Vuetify Version: 4.3.0
Vue Version: 3.5.25
OS: Windows 10 (current)

Steps to reproduce

1. Create a VSplitBtn without the size attribute
2. Create a VSplitBtn with the size="default" attribute value
3. They should have the same size, but don't

Expected Behavior

When using a split button without specifying the size attribute, it should default to default as a value and sit between small and large. It should also match the default size of a regular <v-btn>.

Actual Behavior

The size of the split button without a specifically defined size attribute is off compared to the other sizes and the <v-btn> equivalent.

Reproduction Link

https://play.vuetifyjs.com/#...

Images