Canon are always quick to react on feedback in the photographic community and they genuinely listen to their customer base. So when rumours starting appearing in the various Canon forums regarding their recent firmware update to the R5 and R6 causing problems of intermittent lock up when using the AF-button and SERVO AF they set about working on a fix.
In the pursuit of detecting front / back focus issues, there are several tools that are at our disposal in helping certain if there is a problem with our equipment.