Maybe your TEC-22 is defective. The one my shooting buddy has works PERFECTLY and we shoot it all the time. We haven’t tried the new BX-25 magazines in it yet but if the old RamLine mags function so well there’s no need to assume that the higher quality BX-25 wouldn’t work perfectly too. I predict they’ll be out of business within a year IF they ever even ship ANY in the first place. Time will tell.
I suspect the TEC-22s had a quality control issue. (Dies or molds wearing out in manufacturing process.) In most cases the fussy ones could be tweaked to function reliably with a given brand of mag. The typical problem was the mag would be loose in the receiver and cause feeding issues. Same problem when Armalite quit making the AR-7 and Charter Arms started making it. Many of the Charter Arms version had feeding problems due to sloppy tolerances.