Cauldron won't filled up by a pointed dripstone

I decided to make a infinite source of lava by using dripstone blocks,pointed dripstone and a bucket of lava

when im done making it

i waited for a few minutes to see if the cauldron is being filled up then i notice why it takes so long so i waited for more mins because im thinking that the process can be slow.

and i realized its been 2 minecraft days and the cauldron is still empty so that i came here to report this as a bug