This is still an issue with version 1.70.2 BL of the Ender 5+ firmware. If you enter the commands through a serial connection they work fine. The failure occurs when reading off the SD card. I find it hard to believe that this is the only place that it's misreading G-code off the SD card and that has me concerned. Fortunately I'm moving on to Marlin 2 with a new BTT SKR Pro v1.2.
I am in the process of trying to figure out where the misreading of the command occurs and why. I'd still like to know the extent of the issue.