There is some possibility that these drones were jammed by Ukrainian REB systems and they accidentally went into Poland.
get a map!
poland is not beside russia, it was not a simple bad turn from russian border or bad turn from ukraine due to jamming.. there is belarus and lithuania/latvia buffering poland away from russia..
if anything it could be russia using the baltic sea as incursion border and hopes to then go south east unnoticed to enter ukraine.. or go noticed to poke/provoke poland