If there is a 10 by 1 block platform with a player at one end, a creeper at the other, and a tamed cat sitting (or standing) on the 3rd block, counting from the player's side, the creeper will reach the player and explode no matter what.
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This report is invalid due to the use of a modified client. In the future, please ensure that issues occur in vanilla Minecraft before submitting a report. Also, please check to see if MC-155668 describes your issue.
Reproducible in versions 1.12.2, 1.18.2, 1.20.1, and 1.21.9-rc1. It appears that when pathfinding is insufficient, creepers ignore cats and focus solely on attacking the player.