According to Claude - perhaps not correctly -
the Ortografía de la lengua española (RAE/ASALE, 2010) states in section 3.4.1 that the accent on sólo (adverb) is no longer required since it is rarely ambiguous in context
Regardless, there are cases of ADV with no accent, and non-ADV with accent. Whether we settle on a single lemma or two, it should at least be consistent within the POS tags.
According to Claude - perhaps not correctly -
Regardless, there are cases of ADV with no accent, and non-ADV with accent. Whether we settle on a single lemma or two, it should at least be consistent within the POS tags.