First trick
Mix 250 ml of room temperature water and a tablespoon of sodium thiosulfate until completely dissolved.
Pour the solution directly onto the bleach stain and let it sit for a few minutes, then wash the garment with cold water. Do not rub.
Second trick
Mix equal parts rubbing alcohol and white vinegar. Dampen a cloth in the solution and apply it to the stain, dabbing gently but without rubbing.
Wash the garment with cold water and, if necessary, repeat the process until the stain is completely gone.
As you can see, it is possible to recover a garment that has bleach stains , you just need to apply one of the two tricks described above.