To be fair, SPVO did ask for further proof of my work experience, which I sent two months ago. I'm pretty sure that's the reason for the delay, but the lack of a due date for an answer frustrates me. I could get an answer tomorrow or maybe even next year. When you go beyond the 6 months mark, you are in the limbo. It's totally unpredictable.
My advice for those who are applying to EE is: don't get too eager for the PPR. Last year there were a lot of people who got the PPR in less than 6 months, but since the beginning of this year, there are more and more applications that are beyond the 6 months mark. And I still see many people hoping to get their PPR in 4 or 5 months. That expectation is not healthy and I do not recommend. The key to this whole process is patience. A lot of patience.
My mistake maybe was not sending those work experience documents when I applied. If I did that, this whole process could be over by now. So, I advise to send all the documents when you apply. This will save you some time in the future.
And also read the topic "Reasons for rejection" and try to avoid any mistake.