Bug: Conversations on project conversations page stay in the list when switching to user conversations page

# Problem

Detail the problem here, including any possible solutions.

If a project admin visits the project conversations route and then, without explicitly refreshing the browser navigate to their user conversations route, the conversations loaded for the project route are displayed on the user route.

透過造訪專案對話路由，接著在不重新整理的情況下導覽至使用者對話路由，重現此問題。追蹤對話清單在這兩個路由之間的載入方式，並找出專案資料仍然可見的位置。完成的標準是：完成該次導覽後，使用者路由只顯示使用者對話。

由索引模型根據 Issue 內容生成。