On the 3.0.2 release, setting a workspace as a homepage causes all contents (files, search, tags, starred, etc) to disappear from the sidebar. The vault name, number of files/folders, and settings button at the top of the sidebar are still visible, but the rest of the sidebar is blank.
This seems to happen on mobile only - the sidebars in the macOS app are normal.
Select an existing workspace as the homepage in the plugin settings.
Reload Obsidian on mobile.
Open the sidebar.
{"version":3,"homepages":{"Main Homepage":{"value":"Main Workspace","kind":"Workspace","openOnStartup":true,"hasRibbonIcon":true,"openMode":"Replace all open notes","manualOpenMode":"Keep open notes","view":"Default view","revertView":true,"refreshDataview":false,"autoCreate":true,"autoScroll":false,"pin":false,"commands":[]},"Mobile Homepage":{"value":"Main Workspace","kind":"Workspace","openOnStartup":true,"hasRibbonIcon":true,"openMode":"Replace all open notes","manualOpenMode":"Keep open notes","view":"Default view","revertView":true,"refreshDataview":false,"autoCreate":true,"autoScroll":false,"pin":false,"commands":[]}},"separateMobile":false,"_defaultViewMode":"default","_livePreview":true,"_focusNewTab":"default","_plugins":["homepage"],"_internalPlugins":["file-explorer","global-search","switcher","graph","backlink","canvas","outgoing-link","tag-pane","page-preview","templates","note-composer","command-palette","slash-command","editor-status","starred","markdown-importer","random-note","outline","word-count","slides","audio-recorder","workspaces","file-recovery","sync"],"_obsidianVersion":"1.1.16"}