Placements Splashing to 100LP [Client BUG?]

Hello My name is QndMe and I found this while doing ranked.

Desc,

I was finishing my support placements when my Jungle Placements got splashed into 100LP. I found this weird because when in placements you get to 100LP you automatically get promoted to the next tier. So when I found this i thought it was a bug and so I'm here

How to Recreate,

Get any Role to 97/96 Lp in ranked depending on how much LP you splash into your other ranks. Play another Role in ranked and win the game. The splashing effect should boost it to 100 LP.

I know this is a minor bug but, it's a bug nonetheless so i thought I should report it.