I’m not sure this is even a problem.
THT is supposed to be wave soldered, and during the soldering liters of molten solder are poured all over the board. Have any of these bridges persisted after soldering?
With no pins in the holes the solder is much more likely to bridge the narrow gap between the pads than during the soldering process, where the surface tension is more likely to pull the solder to the pins and pad holes.
But be honest. TO-92 is an absolutely ancient package from an era when automated PCB assembly did not even exist. The legs of this part were probably never intended to put straight into a PCB but meant to be bent apart during assembly, and there are machines to do this, just as for cutting and bending the wires of THT resistors.
I’ve also wondered about the very narrow spacing of the pads in KiCad’s library symbol, but it’s not as if you’ve got not alternative. I count some 30+ variants int the KiCad default lib’s:
Reminds me of a hobby project I built on 1 hole per pad vero board. there was a hair on the PCB during production which shorted some 6 pads together with a very narrow copper track which was under the solder mask and almost impossible to see, especially after I soldered some switches over it.