Tahm Devour Bug

I cannot devour Vayne as Tahm . Tahm can swallow all other allies and enemies perfectly fine but he could not swallow Vayne. Vayne was on ally team when the bug persisted. We even tried standing next to each other for a minute just trying to devour her but it did not work. This bug can costs games because Tahm cannot peel for the Vayne by swallowing.