Excessive community caching

Bug Report

Describe the issue: I think the community caching is still a bit too keen. If I visit a community it's often still the same as last time I was there until I force a refresh. This is impacting "new post" notifications as well as making me think on a manual check that there are no new posts or comments.

Edit I think this is the issue with alt text too. On a "fresh" post I see alt text, if I go to a slightly older one it has gone? So maybe the cache isn't holding that information?

Steps to reproduce:

1. Visit community
2. Manual refresh
3. See that the posts or number of comments on posts has changed.

Device Information

• App Version: 1.0.420 (420)
• Platform: android
• OS Version: V2UIS35.43-12-6-3

Modified Settings

The following settings have been changed from defaults:

• isSwipeEnabled: false (default: true)
• isNotificationEnabled: 2 (default: 0)
• isCommentBarAlwaysShowing: true (default: false)
• shouldAlwaysOpenInDefaultBrowser: true (default: false)
• alwaysShowInstance: true (default: false)
• alwaysTrustDomains: true (default: false)
• shouldUseHighRefresh: false (default: true)
• commentTextStyle: bodyMedium (default: bodyLarge)
• postTitleTextStyle: titleLarge (default: titleMedium)
• customColoursPreset: 3 (default: 0)
• enableCommentNavigator: true (default: false)
• isTopBarFixed: true (default: false)
• isDraftsEnabled: false (default: true)
• shouldAlwaysDisplayAvatars: true (default: false)
• defaultRoute: /community?postCommonListingType=Subscribed&hint=Frontpage (default: null)
• defaultPostSort: New (default: Active)
• applyNsfwInCommunities: false (default: true)
• postActions: [comment, save] (default: [comment, save, none, crosspost])
• shouldCombineMarkdownImages: false (default: true)
• shouldRemembercommentPosition: false (default: true)
• shouldUseProfileBanner: true (default: false)
• shouldLoadAllComments: true (default: false)
• imageDomainRewrites: {} (default: {})