Fairly common to find the digits in a date with a "blob" so to speak somewhere near the date. I have a couple of pennies with the so called blob in some dates as well.
The reason for that die damage makes them about as likely for one year as another. That inner loop is a little "post" of metal on the die, subject to thousands of strikes at high pressure, and it's not hard to imagine them snapping off.
The 1950's Wheat cent dies were used way past the die retirement, so you will find a lot of this happening during those years. Also the 1960 small date coins have more chipping on a lot of areas, thus the retirement of these dies and the issue of the large dates for the same year. Your coin is a large date, so as SD mentioned it can happen on different years as well. We see if less on the single squeeze dies as the profile is a lot less than the multi-hubbed dies. But even on these you can still find chips, less often on the date area.
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