Hello, I recently created a simple plugin to disable block damage from creepers, tnt, end crystals, and wither skulls.
Settings can be configured in config.yml of the plugin folder. Every explosion can be toggled!
For creepers, explosions will STILL do damage, but will NOT blow up any blocks. It is a simple vanilla plugin, so if you have any other plugins or data packs trying to disable creeper explosions it might interfere.