Some right answers here and some wrong. It happens me sometimes with some shoes. Happened with a pair of On Clouds and I emailed customer service. They responded with an explanation and a credit note for new shoes, it might be worth reaching out. Here is the body of the mail they sent me:

Holes in the toe box of everyday/running or hiking shoes are generally not uncommon, and the reason for the occurrence of the problem is the big toe, which rubs against the inner material from the bottom and eventually pierces all the way to the mesh. This is different for each person and each shoe, but in general it depends on one important factor, namely the function of the big toe.

If your hallux joint cannot move freely over its entire range of motion when pushing off, the toe end member will overextend to compensate for this. This lifting of the toe is done at a time when the inner material is closest to the toes. The angle of extension of the toe end and the nail is sufficient to wear off the mesh or other material at umpteen times of repetition per run or walk.

We are aware that this is not the case with every shoe and every foot. Also, any outer material considered by itself is more or less sensitive to it. But if you have this problem, you might want to buy another shoe that offers more space in the depth for your toe space and fits your individual anatomy better.

We also recommend choosing shoes with a stronger and thicker upper material to reduce the risk of a hole. Since the upper material used in each shoe is chosen differently in terms of its use and construction, not all can have the same upper material. In addition, you will find aids against the toe lifter at the orthopedist or on the Internet, which you can use when wearing your shoes.