It is worth noting that in the code, Packed Ice Bricks override the default friction value with 0.6f, but that is the exact same as the default value (0.6f). For reference, (packed) ice has 0.98f and blue ice 0.989f.
Can confirm in 1.21-rc1.Edit: this issue occurs even when the summoned entity has the {Invulnerable:1} tag.
Sotumney
It is worth noting that in the code, Packed Ice Bricks override the default friction value with 0.6f, but that is the exact same as the default value (0.6f).
For reference, (packed) ice has 0.98f and blue ice 0.989f.