Same problem here.
I knew we were in implicit status until a decision was made, but the content of the letter is contradicting that:
You are authorized to continue working with the same conditions (ie: employer and occupation) until March 26, 2021 or until a decision is made on your application, whichever is first.
This is the third time I renew my work permit and I never had such a sentence on the letter.
This time I received 2 letters very similar, one with that sentence and one without.
Another mistake or another problem they are trying to add for us?
I am going to call them closer to this date. If they say I can't work, I will not work and I will not pay taxes to them. No problem.