I am personally very seized with that issue and have raised it with my provincial, territorial and ministerial colleagues. I have written to them on this specific issue as recently as yesterday or the day before.
The disability advisory committee has raised concerns that there are situations in many provinces whereby entitlement to disability support benefits allows a certain income threshold, and that certain income threshold may be beyond the $5,000 that we require for CERB, so somebody may be entitled both to their provincial disability support and be eligible for CERB because they lost that employment income.
Some provinces like British Columbia have waived any kind of clawback so that people can get both of these kinds of benefits. Other provinces have decided to claw it back at a 50% rate, and other provinces are clawing it back entirely. This is a concern because the treatment is different across the country—but that's the reality of a federation. We're raising it at a bunch of different levels are working with PT governments to ensure that the most money possible gets directly into the hands of the people who need it.