There was an old system (v4l) for accessing cameras, and it was changed to a new, incompatible system (v4l2). A lot of programs (most?) were updated to use the new system, but some programs were not updated.
The LD_PRELOAD trick allows old-style programs to operate with the new system, but it's meant to be only a temporary patch.
In short, if the LD_PRELOAD trick fixes an issue you're having, then the problem is in the program, not the driver.
There was an old system (v4l) for accessing cameras, and it was changed to a new, incompatible system (v4l2). A lot of programs (most?) were updated to use the new system, but some programs were not updated.
The LD_PRELOAD trick allows old-style programs to operate with the new system, but it's meant to be only a temporary patch.
In short, if the LD_PRELOAD trick fixes an issue you're having, then the problem is in the program, not the driver.