It’s an abstract analogy but i think it works… When the roof is really needed, it’s not possible to fix it because rain / deadline.

When it’s sunny, no deadlines, the hole doesn’t impede any work, so there’s no need to fix it, difficult to convince PM that it needs fixing.

“Are you willing to own the risk? If so, what will it look like? Can you budget additional time for addressing these bugs, and draft contingency plans?”