I have the Certificate of Residence every year since 2014. And I will have it in January for 2020. Then I am not a tourist, but a resident and a taxpayer.
Immigration is not interested in tax documents for ordinary extensions. They have their own rules, but there is only one law defining the difference between tourists and residents. Its has nothing to do with this special PR.
But you can have a problem if you do not understand the tax law and your DTA. According to the main tax office in Bangkok, they hope for a new law to get info from Immigration. They say it will take 5-10 years. It was before the Coronasituation. Maybe they need income before that....