Trail chambers's trail spawner spawns a lot of mobs and pretended a lot of lag

sir -2689133138263027883 this is the seed of my minecraft pocket edition 1.21.22 i was building a castle above a river at -258 64 -258 there was also a trial chamber below the same coordinates which was used while building the castle A lot of mobs are spwaning from the trail spawner, a lot of bleezs skeletons, zombies or silverfishes are spwaning by the trail spawners , the game is crashing in our particular area.
How is it possible that so many mobs have spawned when the trial chamber is below 0 or I was working at level 64?