Bug is still happening as of Build 5,158 - Sep 14 2024. I was able to recreate it in replay mode. It happens when:
1. Your team does not have a shrine flex (top right)
2. Your team has a two walkers flex (bottom left)
3. Enemy buys a shrine flex (top right)
4. You mouse over an enemy's inventory that has a shrine flex item. It does not occur until your client sees the top right flex item.
Match 12476920 near the end you can test it. Match time ~33:58 - 34:05.