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I is possible to turn off the instablity if you have cheats enabled, the myst-toggleinstability command i believe,but like i said, you need cheats enabled
in the newest version this command works again (myst-toggleinstability before but was buggy in the last version) to disable instability for the specified age.
/myst-twi xx false
xx is the age number.
Had to do this after updating last weekend..the stable ages create with the old version had new symbols and were instable.
Per the wiki, the instability is mostly only on the surface so if you go underground you should be safer. Ofc that is only for the non world eating instability.