Probably to give the pronominal adjective greater emphasis.

Y huyó su | alma a la mansión dichosa (11)

Probably to avoid two successive stresses, though possibly there may be dieresis in mansión.

Don Félix, a buena | hora (8)

Again to avoid stress-shift under the rhythmic stress.

¡El as! ¡el as! aquí está (8)

Y si Dios aquí os envia (8)

In these two examples instead of hiatus there is synalepha with stress-shift, but we have to do with case 2 of synalepha, not case 3.

Que un alma, una vida, | es (8)

Cuando | hacia él fatídica figura (11)

Y el otro ¡Dios santo! y el otro era | él! (12)

¡Villano! mas esto | es (8)

En cada | hijo a contemplar un rey (11)

In some instances hiatus seems to occur for no other reason than to preserve the verse-measure:

Resonando cual lúgubre | eco (10)

Y palacios de | oro y de cristal (11)

¡Y tú feliz, que | hallaste en la muerte (11)

In general hiatus is most likely to occur before the principal rhythmic stress in a verse; that is, before the final stress.

RHYTHM, RHYTHMIC STRESS, THE CAESURAL PAUSE

In English poetry the foot, rather than the syllable, is the unit. The number of feet to a verse is fixed, but the number of syllables varies. In Spanish poetry the number of syllables to a verse is fixed, subject only to the laws of syllable-counting 

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