In any proceeding before an appeal tribunal involving:
(1) A dispute of an individual's initial determination, determination of allowance or denial of allowance of benefits, or redetermination of allowance or denial of benefits, all matters covered by such initial determination, determination, or redetermination shall be deemed to be in issue irrespective of the particular ground or grounds set forth in the notice of appeal.
(2) An individual's right to benefits, all parties shall be afforded an opportunity for hearing after not less than seven days' notice in accordance with RCW
34.05.434.
(3) An appeal relating to benefit determinations or benefit claims, the appeal tribunal, after affording the parties reasonable opportunity for fair hearing, shall render its decision affirming, modifying, or setting aside the determination or decisions of the unemployment compensation division. The parties shall be duly notified of such appeal tribunal's decision together with its reasons therefor, which shall be deemed to be the final decision on the initial determination or the claim for waiting period credit or the claim for benefits unless, within thirty days after the date of notification or mailing, whichever is the earlier, of such decision, further appeal is perfected pursuant to the provisions of this title relating to review by the commissioner.