Piece of crown cracked off after less than two years

[Spottedowlet]

I had a porcelain crown done privately in June 2024 on the lower left, third molar in from the back, by a prosthodontist. The crown was done because a filling had come out, taking a bit of tooth with it and they said it needed a crown.
In April 2026 a lentil-sized piece of the crown cracked off.
The prosthodontist who did the crown has now retired, and a partner in the practice who has done some work for me before (so far so good) said a new crown was needed. He was vague about why the crown cracked off. He did prep and temp for a new crown. He said he had reduced the surface area of the tooth on the tongue side; I'm not sure why.
They haven't billed yet, but I saw a note on the chart for a charge that is half of their current charge for a crown.
I have other crowns done by the retired prosthodontist which have lasted upwards of 7 years, and a bridge from another practice that has lasted decades.
I don't know what to make of all this.
Any comments or observations would be very welcome. TIA.

I guess crowns can break just as teeth can?
I have two crowns that are over 40 years old and fine. Another one done three years ago has failed. It's the root canal that's leaking and it's not a straight forward replacement, I may lose the tooth.

The cracked crown may have been caused by wear or pressure; ask your new prosthodontist for more details about why it cracked. The reduction of surface area could be for better crown fit, but clarification is needed. Confirm the charge and material used for the new crown to ensure it matches your expectations.