Flywheel 6 gear switch

Hello.

I have the following problem. I had to expand my gear because of bearing damage. Gear output shaft has bearing damage. I made the clutch in this train today with new and, look, my flywheel has a crack around the needle bearing which leads to the transmission input shaft. In this area, in my opinion, no great powers, no idea where the crack can come from??? As mentioned above, it is not on the surface where the clutch is operating but directly around the needle bearing.
I've got two cars for that now. Master different statements.
Make a new one because could tear further and get air and wave would not be led anymore etc. etc.
And another time, just leave it, is a casting part which is processed no clue why it is torn is just casting. Maybe it won't tear any further and even if no further damage can happen, it wouldn't blow out any further or so that gear shaft is only run there and nothing more.
Was sagt ihr dazu???