Ties are allowed, but only in very special circumstances. If for some reason they can’t keep playing, the game is supposed to be suspended and then restarted at a later date. But if it’s the last time the two teams play each other in the season and the playoff tiebreaker rules aren’t an issue, they just end the game in a tie. It doesn’t show up in the standings, so you probably didn’t even realize it happens! The player stats count, however.

The last tie in baseball was in 2016 - Cubs vs Pirates. The game ended in the 6th inning due to rain.