[WP Employer Change] Employer ending contract before end of WP.Help !

Hello,
I'm an expat working in Brussels on Work Permit B. My employer applied for WP renewal in the month of May 2019 and it was received within 4 weeks. I also got my RP renewed at the same time. The new work permit and RP are valid till May 2020 now. The process of renewal took only 4 weeks, which is a bit strange because even though he applied for renewal after 3rd Jan 2019, the work permit was renewed for only 1 year. He told me that this was not a single permit and that is why the renewal took only 4 weeks.

Now, my end client decided to end the contract and therefore my employer has also decided to end the contract with me as well, by the end of October. I found another opportunity and the new employer initiated the work permit in the third week of August 2019. I have heard people saying that the new Single permit takes 3-5 months and this has got me worried. I checked with the work permit department and they told me that since you have valid RP till next year, your new employer will get a copy of WP within 4-5 weeks and you can start working with them after Dimona and Limosa is performed. They also told that meanwhile, the application for a single permit can be processed in parallel. This is a gray area and I get different answers from different people and no one is sure. Does anyone have any useful information and any pointers to what can be done to make sure that I don't stay unemployed for very long?
Any legal experts out there?