loop inductance of half bridge
When switching a transistor off (or on), the current changes from the transistor to its free-wheeling diode (which is one of the anti-parallel diodes). This causes a voltage-spike due to the loop inductance \$u_{spike} = L_{loop} \cdot \frac{di}{dt}\$ which might be harmful for semiconductors and/or DC link cap. This is obviously the case with a large loop inductance \$L_{loop}\$ and/or high \$\frac{di}{dt}\$, which means fast switching, and which is a typical feature of wind band-gap devices like SiC or GaN.
With the right gate driver settings you can reduce the switching speed to avoid this voltage spike, but lower switching speed will increase switching losses. So better to keep the loop inductance as small as possible.