3.0 drivers in constraint gone missing. But the driver but still works

So I have a rig that I made in 2.93 that I recently just updated to 3.0. And in that rig, I have a driver that toggles a constraint on or off. At first, everything went fine until I realized that the driver had gone missing. And the weird thing is that everything seems to work fine as if the drivers were there. And when I tried to open the rig file in 2.93, the driver is there.

Because of this, I did an experiment to replicate this bug. In this experiment, I have a cube with a wireframe modifier and a Transform constraint. This cube also has two custom properties that act as a switch for the modifier & constraint. In Blender 2.93, both custom properties switch the modifier & constraint like normal. And the driver in both modifier & constraint can be right-clicked and edited. But when the same file was opened in 3.0, the driven in the Transform constraint somehow disappear. And the weird thing is that the constraint acts like the driver is still there, it even appears in the Driver Editor, but not in the constraint itself.

Here's a video on the experiment

And here's a report I made developer.blender.org/T94063