Taginput: "size" property is ignored on "maxtags" value reached

[dandelionred]

Overview of the problem

Buefy version: current (0.8.10)
Vuejs version: current (2.6.11)
OS/Browser: all

Description

When maxtags value on a taginput component is reached, the rendering mode is changed and in the new mode size property is ignored.

Steps to reproduce

1. Open codepen from this demo https://buefy.org/documentation/taginput/#sizes
2. Append maxtags="4" to the list of <b-taginput> properties for each input.
3. Add a new tag and notice all sizes are reset to the default one.
4. Delete the 4th tag and notice all sizes are back.

Expected behavior

size should be respected when maxtags value is reached.

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3 tags, size is applied

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4 tags, size is ignored