Each of the following shall be void:

(a) any purported termination of or suspension from employment of an adopting parent while absent from work -

(i) on adoptive leave or additional adoptive leave, or

(ii) attending pre-adoption classes or meetings in accordance with section 11A;

(b) any notice of termination of the employment of an adopting parent given during the parent's absence from work -

(i) on adoptive leave or additional adoptive leave, or

(ii) while attending pre-adoption classes or meetings in accordance with that section,

and expiring after the absence.